YUI module support.

Determine if preprocessed template will be wrapped in YUI module code. The module name will be composed of the name
of the namespace and the file name without extension. i.e. in case namespace is "App.rootView" and template file is
"Button.hbs" the resulting YUI module name is App.rootView.Button and compiled template is stored in Y.App.rootView.Button.
If namespace is omitted the template is stored in Y.Ember.TEMPLATES.<filename without extension>.