Test for style block being maintained.

common/lib/xmodule/xmodule/js/src/html/edit.coffee

@@ -46,6 +46,12 @@ class @HTMLEditingDescriptor
       height: '400px',
       menubar: false,
       statusbar: false,
+      # Necessary to avoid stripping of style tags.
+      valid_children : "+body[style]",
+      # Prevent TinyMCE from adding extra <p>&nbsp;</p> in code.
+      forced_root_block : "",
+      force_br_newlines : true,
+      force_p_newlines : false,
       setup: @setupTinyMCE,
       # Cannot get access to tinyMCE Editor instance (for focusing) until after it is rendered.
       # The tinyMCE callback passes in the editor as a paramter.