Killed code Markdown button.

With its confusing and limited behavior, along with its not so great icon, this markdown button in the editor wasn't so helpful. People who are likely to insert code into a markdown post to begin with, likely have a good idea of how to already do that or where to find information on how to code in markdown (there is also a link next to the preview button).

h/static/scripts/directives/markdown.coffee

@@ -247,9 +247,6 @@ markdown = ['$filter', '$sanitize', '$sce', '$timeout', ($filter, $sanitize, $sc
 
     scope.insertQuote = ->
       scope.applyBlockMarkup("> ")
-      
-    scope.insertCode = ->
-      scope.applyBlockMarkup("    ")
 
     # Keyboard shortcuts for bold, italic, and link.
     elem.on

h/templates/client/markdown.html

@@ -12,7 +12,6 @@
   <i class="h-icon-math markdown-tools-button" ng-click="insertMath()" title="Insert mathematical notation (LaTex is supported)"></i>
   <i class="h-icon-numlist markdown-tools-button" ng-click="insertNumList()" title="Insert numbered list"></i>
   <i class="h-icon-ulist markdown-tools-button" ng-click="insertList()" title="Insert list"></i>
-  <i class="h-icon-code markdown-tools-button" ng-click="insertCode()" title="Insert code"></i>
 </div>
 <textarea class="form-input form-textarea js-markdown-input"
           ng-hide="readonly || preview"