fix compatibility for PHP5.4
fix compatibility for PHP5.4

- Use PHPUnit 3.7 so debugging with PHPStorm is possible
- Use dev version of Prophecy so we can have verbose errors

sstok/gush,gushphp/gush,pierredup/gush,webflo/gush,gushphp/gush,cordoval/gush,gushphp/gush,sstok/gush,gushphp/gush,pierredup/gush,cordoval/gush,webflo/gush,pierredup/gush,sstok/gush,webflo/gush,cordoval/gush