Allow Markdown for header.image.caption

- Simplify and remove extra variables by condensing into one

_layouts/default.html

@@ -24,8 +24,8 @@ layout: compress
         "{{ page.header.image | prepend: "/images/" | prepend: absurl }}"
       {% endif %}
       alt="{{ page.title }}">
-    {% if page.header.credit %}
+    {% if page.header.caption %}
-      <span class="image-credit">Photo Credit: <a href="{{ page.header.credit.url }}">{{ page.header.credit.caption }}</a></span>
+      <span class="image-caption">{{ page.header.caption | markdownify | remove: "<p>" | remove: "</p>" }}</span>
     {% endif %}
     </div><!-- /.image-wrap -->
   {% endif %}

_pages/about.md

@@ -2,10 +2,6 @@
 permalink: /about/
 title: "About the Theme"
 modified: 2014-08-08T20:53:07.573882-04:00
-image:
-  feature: sample-image-2.jpg
-  credit: WeGraphics
-  creditlink: http://wegraphics.net/downloads/free-ultimate-blurred-background-pack/
 ---
 
 Minimal Mistakes is responsive Jekyll theme with large featured images and solid typography. As the name implies the styling is fairly minimal to make it easier for you to build on top of.

_pages/home.md

@@ -4,7 +4,5 @@ permalink: /
 excerpt: "A minimal Jekyll theme for your blog by designer Michael Rose."
 header:
   image: unsplash-image-7.jpg
-  credit:
+  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
-    caption: Unsplash
-    url: https://unsplash.com
 ---

_posts/2012-03-15-template-featured-image-horizontal.md

@@ -3,9 +3,7 @@ title: "Template: Featured Image (Horizontal)"
 date: 2012-03-15T15:15:12+00:00
 header:
   image: unsplash-image-1.jpg
-  credit:
+  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
-    caption: Unsplash
-    url: https://unsplash.com
 categories:
   - Template
   - Uncategorized

_posts/2012-03-15-template-featured-image-text-readability.md

@@ -2,9 +2,7 @@
 title: "Template: Featured Image And Text Readability"
 header:
   image: unsplash-image-4.jpg
-  credit:
+  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
-    caption: Unsplash
-    url: https://unsplash.com
 tags: 
   - sample post
   - readability

_posts/2012-03-15-template-featured-image-vertical.md

@@ -3,9 +3,7 @@ title: "Template: Featured Image (Vertical)"
 date: 2012-03-15T15:36:32+00:00
 header:
   image: unsplash-image-6.jpg
-  credit:
+  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
-    caption: Unsplash
-    url: https://unsplash.com
 categories:
   - Template
   - Uncategorized

_sass/typography.scss

@@ -66,7 +66,7 @@ figcaption {
    Feature image captions
    ========================================================================== */
 
-.image-credit {
+.image-caption {
 	@include grid(12,10);
 	@include prefix(12,1);
 	@include suffix(12,1);