Implement zf2 cli support

see: https://github.com/prolic/HumusPHPUnitModule/issues/9

new options available:
--version, see: https://github.com/prolic/HumusPHPUnitModule/issues/11
--strict, see: https://github.com/prolic/HumusPHPUnitModule/issues/6
--verbose, see: https://github.com/prolic/HumusPHPUnitModule/issues/10
--debug, see: https://github.com/prolic/HumusPHPUnitModule/issues/5
--help, see: https://github.com/prolic/HumusPHPUnitModule/issues/8