Changed front matter "credit" to "caption" and "url" to "caption_url"

This makes more sense and standardize frontmatter.

_posts/design/2014-07-09-post-left-sidebar.md

@@ -11,8 +11,8 @@ categories:
     - design
 image:
     title: "unsplash_1.jpg"
-    credit: Unsplash.com
-    url: http://unsplash.com
+    caption: Unsplash.com
+    caption_url: http://unsplash.com
 ---
 *Feeling Responsive* shows metadata by default. The default behaviour can be changed via `config.yml`. To show metadata at the end of a page/post just add the following to front matter:
 

_posts/design/2014-07-10-page.md

@@ -14,8 +14,8 @@ tags:
     - post format
 image:
     title: "unsplash_1.jpg"
-    credit: Unsplash.com
-    url: http://unsplash.com
+    caption: Unsplash.com
+    caption_url: http://unsplash.com
 author: mo
 ---
 *Feeling Responsive* shows metadata by default. The default behaviour can be changed via `config.yml`. To show metadata at the end of a page/post just add the following to front matter:

_posts/design/2014-07-10-post-right-sidebar.md

@@ -12,8 +12,8 @@ categories:
 image:
     thumb: "unsplash_2_thumb.jpg"
     title: "unsplash_2.jpg"
-    credit: Unsplash.com
-    url: http://unsplash.com
+    caption: Unsplash.com
+    caption_url: http://unsplash.com
 ---
 *Feeling Responsive* shows metadata by default. The default behaviour can be changed via `config.yml`. To show metadata at the end of a page/post just add the following to front matter:
 

_posts/design/2015-03-12-no-header-but-image.md

@@ -12,8 +12,8 @@ tags:
 header: no
 image:
     title: unsplash_eagle.jpg
-    credit: This is a caption for the header image with link
-    url: https://unsplash.com/
+    caption: This is a caption for the header image with link
+    caption_url: https://unsplash.com/
 ---
 First turn of the header with `header: no`. Than add an image to with the following code. The caption is optional.
 
@@ -21,8 +21,8 @@ First turn of the header with `header: no`. Than add an image to with the follow
 header: no
 image:
     title: unsplash_eagle.jpg
-    credit: This is a caption for the header image with link
-    url: https://unsplash.com/
+    caption: This is a caption for the header image with link
+    caption_url: https://unsplash.com/
 ~~~
 
 

_posts/design/2015-11-15-comments.md

@@ -5,8 +5,8 @@ title: "Now with Comments!"
 teaser: "For a blog you need comments. Like all those other jekyll themes we baked in Disqus. It's easy to set, it works and makes a static jekyll blog more dynamic."
 header:
     image_fullwidth: "header_typewriter.jpg"
-    credit: Image by Florian Klauer
-    url: "http://florianklauer.de/"
+    caption: Image by Florian Klauer
+    caption_url: "http://florianklauer.de/"
 image:
     thumb:  typewriter_thumb.jpg
     homepage: homepage_typewriter.jpg

_posts/design/2015-11-16-typography.md

@@ -8,8 +8,8 @@ header: no
 image:
     thumb:  homepage_typography_thumb.jpg
     homepage: homepage_typography.jpg
-    credit: Image by Antonio
-    url: "http://www.aisleone.net/"
+    caption: Image by Antonio
+    caption_url: "http://www.aisleone.net/"
 categories:
     - design
 ---