Fix tests depending on installer

package.json

@@ -83,7 +83,7 @@
         "c9.ide.help.support": "#60e88f5680",
         "c9.ide.imgeditor": "#08bbc53578",
         "c9.ide.immediate": "#6845a93705",
-        "c9.ide.installer": "#c6c5adb152",
+        "c9.ide.installer": "#45d316217b",
         "c9.ide.mount": "#cb45b621f1",
         "c9.ide.navigate": "#64156c7f4a",
         "c9.ide.newresource": "#f1f0624768",

plugins/c9.vfs.standalone/www/test.js

@@ -400,7 +400,7 @@ require([
                     console.warn(msg);
                 }
             },
-            "installer": { createSession : function(){}, reinstall: function(){} },
+            "installer": { createSession : function(){}, reinstall: function(){}, isInstalled: function(){ return true; } },
             "run.gui": { getElement : function(){} },
             "debugger": {debug: function() {}, stop: function(){}},
             "focusManager": {