allow setting default syntax for the project

package.json

@@ -1,7 +1,7 @@
 {
     "name": "c9",
     "description": "New Cloud9 Client",
-    "version": "3.0.1",
+    "version": "3.0.2357",
     "author": "Ajax.org B.V. <info@ajax.org>",
     "private": true,
     "main": "bin/c9",

plugins/c9.ide.ace/ace.js

@@ -1375,7 +1375,7 @@ define(function(require, exports, module) {
         }
         
         function getMode(syntax) {
-            syntax = (syntax || "text").toLowerCase();
+            syntax = (syntax || settings.get("project/ace/@defaultSyntax") || "text").toLowerCase();
             if (syntax.indexOf("/") == -1)
                 syntax = "ace/mode/" + syntax;