Don't escape path for ember

closes #5495

- we have to escape paths for bower, but ember already does this

Gruntfile.js

@@ -315,7 +315,7 @@ var _              = require('lodash'),
                     },
                     options: {
                         execOptions: {
-                            cwd: path.resolve(cwd + '/core/client/'),
+                            cwd: path.resolve(process.cwd() + '/core/client/'),
                             stdout: false
                         }
                     }