Fix ezcTestRegressionTest::suite() as ezcMvcRegressionSuite no longer exists
Fix unit tests: make ezcTestRegressionTest abstract, as it is never instanciated
Fixes the following error that occurs when running Feed unit tests :

There was 1 failure:

1) Warning
No tests found in class "ezcTestRegressionTest".
Merge pull request #3 from guillaumelecerf/fix_unittests

Fix unit tests