Add: PSR2 checks to travis
Fix: Typo wapper -> wrapper
Add: Coveralls
Fix: Runners not running CommandBuilder Commands

Runners were type hinting on command directly, rather than on
AbstractCommand.

Fixes #1
Merge branch 'develop'

* develop:
  Fix: Runners not running CommandBuilder Commands
  Add: Coveralls
  Fix: Typo wapper -> wrapper
  Add: PSR2 checks to travis