Support git code syntax in live preview

Add autocrlf values for Windows, Linux, and OS X.

.gitattributes

@@ -1,4 +1,11 @@
 # https://help.github.com/articles/dealing-with-line-endings
+#
+# For Mac & Linux
+# git config --global core.autocrlf input
+#
+# For windows
+# git config --global core.autocrlf true
+#
 # Set default behaviour, in case users don't have core.autocrlf set.
 * text=auto
 

lib/gollum/frontend/public/gollum/livepreview/js/livepreview.js

@@ -298,6 +298,8 @@ var makePreviewHtml = function () {
   }
 
   var prevTime = new Date().getTime();
+  // Handle gollum file code insertion syntax.
+  text = text.replace(/^[ \t]*``` ?([^:\n\r]+:[^`\n\r]+)```/gm, '``$1``');
   text = md_to_html( text );
 
   // Calculate the processing time of the HTML creation.