feat(parser): automatically observe aliased ng- attributes and natively instantiate regular expressions

Functions returned by $parse have a constant and literal property on them ([docs for it](https://github.com/angular/angular.js/blob/3df2ccae0f59da4ef7ff7ab03c086a69acb66555/src/ng/parse.js#L971-L975))

I believe they're both true in this case