mw.util.getActionFrom incorrectly returns null

mw.util.getActionFrom incorrectly returns null
* Return 'view' for urls like:
 - /w/index.php?title=Foobar
* Anything else, fallback to 'view' (just like PHP does)
* JSHint
 - ['view'] is better written in dot notation.
 - 'action' was already defined on line 235.
 - 'actionRe' is defined multiple times (loop).
 - Use '===' to compare with '0'.
 - 'title' is already defined.
 >> The code check passed 100%!
* Adding QUnit test for getActionFrom and getTitleFrom

(Follow-up r87964)