* Add test for IsACallSniff.
* Fix doublicate finds in IsACallSniff and
InstantiationWithObjectManagerSniff.
* Both didn't stop looking for class at end of expression.
Relates: #46
* Allow phpcbf / diff to be optional, as not all tests are fixable.
* Provide more information in case of error.
* Provide phpunit dist to run phpunit without anything special.
Relates: #46