Debian control & setup.py dependency fixed

 - python-setuptools and python-distutils dependency removed from debian/control
 - corrupted msgpack package name fixed in setup.py
App check fixed. Tools now returns various exit code depending on errors occurred

 - postinst script has been removed for useless
 - 'cocaine-tool app check' now returns exit code 1 if application doesn't running
 - changelog changed
 - bash completion for 'cocaine-tool' app check has been implemented
 - version fixed