AutoLoaderTest: Add support for class aliases

* Changed the regex to match class aliases, and added a check to
  also ensure that all aliases for a class are in the same file as
  the class (see cb77e59f7c99 for explanation).
* Removed support for the seemingly unmaintained Parsekit extension
  (no release since 2009, and known not to compile against PHP 5.4).
  The test would currently fail if Parsekit were used anyway because
  the class MyLocalSettingsGenerator is commented out.

Change-Id: I7be2352f4659abc7b4952a9f74a14d0cef911614
Merge "AutoLoaderTest: Add support for class aliases"