Set whitespace handling via CSS.

Relevant for travis-ci/travis-ci#2003.

assets/scripts/app/helpers/helpers.coffee

@@ -41,7 +41,6 @@ require 'config/emoij'
     if !!options.repo
       message = @githubify(message, options.repo.get('owner'), options.repo.get('name'))
     message.replace /\n/g, '<br/>'
-    message.replace /^ +/, '&nbsp;'
 
   pathFrom: (url) ->
     (url || '').split('/').pop()

assets/styles/main/summary.sass

@@ -29,5 +29,5 @@
     white-space: nowrap
 
   .message
-    white-space: normal
+    white-space: pre-wrap
     min-width: 0