Merge pull request #1127 from MITx/bugfix/kevin/mathjax-rendering

Bugfix/kevin/mathjax rendering

lms/static/coffee/src/discussion/utils.coffee

@@ -249,7 +249,10 @@ class @DiscussionUtil
           $3
       else if RE_DISPLAYMATH.test(text)
         text = text.replace RE_DISPLAYMATH, ($0, $1, $2, $3) ->
-          processedText += $1 + processor("$$" + $2 + "$$", 'display')
+          #processedText += $1 + processor("$$" + $2 + "$$", 'display')
+          #bug fix, ordering is off
+          processedText =  processor("$$" + $2 + "$$", 'display') + processedText
+          processedText = $1 + processedText
           $3
       else
         processedText += text