Merge branch 'release/3.1.5'

The `overlay_filter` param lets you darken or otherwise filter the hero header picture to make the text content pop out more.

You can use it by specifying the opacity (between 0 and 1) of a black overlay like so:

```yaml
excerpt: "This post should display a **header with an overlay image**, if the theme supports it."
header:
  overlay_image: unsplash-image-1.jpg
  overlay_filter: 0.5 # same as adding an opacity of 0.5 to a black background
  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
  cta_label: "More Info"
  cta_url: "https://unsplash.com"
```

Or if you want to do more fancy things, go full rgba: 

```yaml
excerpt: "This post should display a **header with an overlay image**, if the theme supports it."
header:
  overlay_image: unsplash-image-1.jpg
  overlay_filter: rgba(255, 0, 0, 0.5)
  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
  cta_label: "More Info"
  cta_url: "https://unsplash.com"
```

CHANGELOG.md

@@ -1,3 +1,15 @@
+## [3.1.5](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.5)
+
+### Maintenance
+
+- Fix `www` and `https` links in author profile include [#293](https://github.com/mmistakes/minimal-mistakes/pull/293)
+
+## [3.1.4](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.4)
+
+### Enhancements
+
+- Add overlay_filter param to hero headers [#298](https://github.com/mmistakes/minimal-mistakes/pull/298)
+
 ## [3.1.3](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.3)
 
 ### Enhancements

_includes/author-profile.html

@@ -35,64 +35,64 @@
         <li><a href="https://keybase.io/{{ author.keybase }}"><i class="fa fa-fw fa-key" aria-hidden="true"></i> Keybase</a></li>
       {% endif %}
       {% if author.twitter %}
-        <li><a href="http://twitter.com/{{ author.twitter }}"><i class="fa fa-fw fa-twitter-square" aria-hidden="true"></i> Twitter</a></li>
+        <li><a href="https://twitter.com/{{ author.twitter }}"><i class="fa fa-fw fa-twitter-square" aria-hidden="true"></i> Twitter</a></li>
       {% endif %}
       {% if author.facebook %}
-        <li><a href="http://facebook.com/{{ author.facebook }}"><i class="fa fa-fw fa-facebook-square" aria-hidden="true"></i> Facebook</a></li>
+        <li><a href="https://www.facebook.com/{{ author.facebook }}"><i class="fa fa-fw fa-facebook-square" aria-hidden="true"></i> Facebook</a></li>
       {% endif %}
       {% if author.google_plus %}
-        <li><a href="http://plus.google.com/+{{ author.google_plus }}"><i class="fa fa-fw fa-google-plus-square" aria-hidden="true"></i> Google+</a></li>
+        <li><a href="https://plus.google.com/+{{ author.google_plus }}"><i class="fa fa-fw fa-google-plus-square" aria-hidden="true"></i> Google+</a></li>
       {% endif %}
       {% if author.linkedin %}
-        <li><a href="http://linkedin.com/in/{{ author.linkedin }}"><i class="fa fa-fw fa-linkedin-square" aria-hidden="true"></i> LinkedIn</a></li>
+        <li><a href="https://www.linkedin.com/in/{{ author.linkedin }}"><i class="fa fa-fw fa-linkedin-square" aria-hidden="true"></i> LinkedIn</a></li>
       {% endif %}
       {% if author.xing %}
-        <li><a href="http://www.xing.com/profile/{{ author.xing }}"><i class="fa fa-fw fa-xing-square" aria-hidden="true"></i> XING</a></li>
+        <li><a href="https://www.xing.com/profile/{{ author.xing }}"><i class="fa fa-fw fa-xing-square" aria-hidden="true"></i> XING</a></li>
       {% endif %}
       {% if author.instagram %}
-        <li><a href="http://instagram.com/{{ author.instagram }}"><i class="fa fa-fw fa-instagram" aria-hidden="true"></i> Instagram</a></li>
+        <li><a href="https://instagram.com/{{ author.instagram }}"><i class="fa fa-fw fa-instagram" aria-hidden="true"></i> Instagram</a></li>
       {% endif %}
       {% if author.tumblr %}
-        <li><a href="http://{{ author.tumblr }}.tumblr.com"><i class="fa fa-fw fa-tumblr-square" aria-hidden="true"></i> Tumblr</a></li>
+        <li><a href="https://{{ author.tumblr }}.tumblr.com"><i class="fa fa-fw fa-tumblr-square" aria-hidden="true"></i> Tumblr</a></li>
       {% endif %}
       {% if author.bitbucket %}
-        <li><a href="http://bitbucket.org/{{ author.bitbucket }}"><i class="fa fa-fw fa-bitbucket" aria-hidden="true"></i> Bitbucket</a></li>
+        <li><a href="https://bitbucket.org/{{ author.bitbucket }}"><i class="fa fa-fw fa-bitbucket" aria-hidden="true"></i> Bitbucket</a></li>
       {% endif %}
       {% if author.github %}
-        <li><a href="http://github.com/{{ author.github }}"><i class="fa fa-fw fa-github" aria-hidden="true"></i> Github</a></li>
+        <li><a href="https://github.com/{{ author.github }}"><i class="fa fa-fw fa-github" aria-hidden="true"></i> Github</a></li>
       {% endif %}
       {% if author.stackoverflow %}
-        <li><a href="http://stackoverflow.com/users/{{ author.stackoverflow }}"><i class="fa fa-fw fa-stack-overflow" aria-hidden="true"></i> Stackoverflow</a></li>
+        <li><a href="https://www.stackoverflow.com/users/{{ author.stackoverflow }}"><i class="fa fa-fw fa-stack-overflow" aria-hidden="true"></i> Stackoverflow</a></li>
       {% endif %}
       {% if author.lastfm %}
-        <li><a href="http://lastfm.com/user/{{ author.lastfm }}"><i class="fa fa-fw fa-lastfm-square" aria-hidden="true"></i> Last.fm</a></li>
+        <li><a href="https://lastfm.com/user/{{ author.lastfm }}"><i class="fa fa-fw fa-lastfm-square" aria-hidden="true"></i> Last.fm</a></li>
       {% endif %}
       {% if author.dribbble %}
-        <li><a href="http://dribbble.com/{{ author.dribbble }}"><i class="fa fa-fw fa-dribbble" aria-hidden="true"></i> Dribbble</a></li>
+        <li><a href="https://dribbble.com/{{ author.dribbble }}"><i class="fa fa-fw fa-dribbble" aria-hidden="true"></i> Dribbble</a></li>
       {% endif %}
       {% if author.pinterest %}
-        <li><a href="http://www.pinterest.com/{{ author.pinterest }}"><i class="fa fa-fw fa-pinterest" aria-hidden="true"></i> Pinterest</a></li>
+        <li><a href="https://www.pinterest.com/{{ author.pinterest }}"><i class="fa fa-fw fa-pinterest" aria-hidden="true"></i> Pinterest</a></li>
       {% endif %}
       {% if author.foursquare %}
-        <li><a href="http://foursquare.com/{{ author.foursquare }}"><i class="fa fa-fw fa-foursquare" aria-hidden="true"></i> Foursquare</a></li>
+        <li><a href="https://foursquare.com/{{ author.foursquare }}"><i class="fa fa-fw fa-foursquare" aria-hidden="true"></i> Foursquare</a></li>
       {% endif %}
       {% if author.steam %}
-        <li><a href="http://steamcommunity.com/id/{{ author.steam }}"><i class="fa fa-fw fa-steam-square" aria-hidden="true"></i> Steam</a></li>
+        <li><a href="https://steamcommunity.com/id/{{ author.steam }}"><i class="fa fa-fw fa-steam-square" aria-hidden="true"></i> Steam</a></li>
       {% endif %}
       {% if author.youtube %}
-        <li><a href="https://youtube.com/user/{{ author.youtube }}"><i class="fa fa-fw fa-youtube-square" aria-hidden="true"></i> Youtube</a></li>
+        <li><a href="https://www.youtube.com/user/{{ author.youtube }}"><i class="fa fa-fw fa-youtube-square" aria-hidden="true"></i> YouTube</a></li>
       {% endif %}
       {% if author.soundcloud %}
-        <li><a href="http://soundcloud.com/{{ author.soundcloud }}"><i class="fa fa-fw fa-soundcloud" aria-hidden="true"></i> Soundcloud</a></li>
+        <li><a href="https://soundcloud.com/{{ author.soundcloud }}"><i class="fa fa-fw fa-soundcloud" aria-hidden="true"></i> Soundcloud</a></li>
       {% endif %}
       {% if author.weibo %}
-        <li><a href="http://www.weibo.com/{{ author.weibo }}"><i class="fa fa-fw fa-weibo" aria-hidden="true"></i> Weibo</a></li>
+        <li><a href="https://www.weibo.com/{{ author.weibo }}"><i class="fa fa-fw fa-weibo" aria-hidden="true"></i> Weibo</a></li>
       {% endif %}
       {% if author.flickr %}
-        <li><a href="http://www.flickr.com/{{ author.flickr }}"><i class="fa fa-fw fa-flickr" aria-hidden="true"></i> Flickr</a></li>
+        <li><a href="https://www.flickr.com/{{ author.flickr }}"><i class="fa fa-fw fa-flickr" aria-hidden="true"></i> Flickr</a></li>
       {% endif %}
       {% if author.codepen %}
-        <li><a href="http://codepen.io/{{ author.codepen }}"><i class="fa fa-fw fa-codepen" aria-hidden="true"></i> CodePen</a></li>
+        <li><a href="https://codepen.io/{{ author.codepen }}"><i class="fa fa-fw fa-codepen" aria-hidden="true"></i> CodePen</a></li>
       {% endif %}
       {% if author.vine %}
         <li><a href="https://vine.co/u/{{ author.vine }}"><i class="fa fa-fw fa-vine" aria-hidden="true"></i> Vine</a></li>

_includes/page__hero.html

@@ -18,8 +18,14 @@
   {% capture overlay_img_path %}{{ page.header.overlay_image | prepend: "/images/" | prepend: base_path }}{% endcapture %}
 {% endif %}
 
+{% if page.header.overlay_filter contains "rgba" %}
+  {% capture overlay_filter %}{{ page.header.overlay_filter }}{% endcapture %}
+{% elsif page.header.overlay_filter %}
+  {% capture overlay_filter %}rgba(0, 0, 0, {{ page.header.overlay_filter }}){% endcapture %}
+{% endif %}
+
 <div class="page__hero{% if page.header.overlay_color or page.header.overlay_image %}--overlay{% endif %}"
-  style="{% if page.header.overlay_color %}background-color: {{ page.header.overlay_color | default: 'transparent' }};{% endif %} {% if overlay_img_path %}background-image: url('{{ overlay_img_path }}');{% endif %}"
+  style="{% if page.header.overlay_color %}background-color: {{ page.header.overlay_color | default: 'transparent' }};{% endif %} {% if overlay_img_path %}background-image: {% if overlay_filter %}linear-gradient({{ overlay_filter }}, {{ overlay_filter }}), {% endif %}url('{{ overlay_img_path }}');{% endif %}"
 >
   {% if page.header.overlay_color or page.header.overlay_image %}
     <div class="wrapper">
@@ -46,4 +52,4 @@
   {% if page.header.caption %}
     <span class="page__hero-caption">{{ page.header.caption | markdownify | remove: "<p>" | remove: "</p>" }}</span>
   {% endif %}
-</div>
+</div>