PHPUnit tests for class finding and class loading, the latter based on StreamWrapper instead of fixtures.

Let xautoload(NULL) return the service container, to allow a syntax like xautoload(NULL)->finder, with full type hinting and stuff

Only activate APC if drupal_hash_salt is available. This will make it possible to use xautoload.early.php outside of Drupal, e.g. in phpunit.

Fix xautoload when enabling multiple modules at once (incl xautoload). See https://drupal.org/node/2078587

Don't break on classes beginning with underscore. Patch from http://drupal.org/node/1930084#comment-7409958

completely remove composer support. this can be re-added once a common dir for composer files has been decided on