fix for issue #139 - https://github.com/sebastianbergmann/phpunit-mock-objects/issues/139
Typo fix
getMockForAbstractClass() should only append abstract methods from the class that is being tested
Adding @roman-shuhov test that verifies trait mocks
Improving generator test
Adding ```@requires PHP 5.4.0``` annotation on tests that covers ```getMockForTrait()```
Merge pull request #157 from lcobucci/2.0

Allowing the usage of non existing methods with getMockForAbstractClass()