Revert "Fix installation with recent version composer"

This reverts commit 4951c15576316a13cacf5804c0c32de9dcfa0aca.
Merge pull request #7 from guillaumelecerf/minimum_stability

Revert "Fix installation with recent version composer"
Implement class autoloading for the unit tests
Fix expected unit tests values
Add missing mySlashHandler test class
Fix test RSS URL
Fix unit tests: make those classes abstract, as they are never instanciated
Fixes:

There were 2 failures:

1) Warning
No tests found in class "ezcFeedRegressionTest".

2) Warning
No tests found in class "ezcFeedTestCase".