Implemented git fetcher
pep8 fix
Fixed setup.py: removed raava.apps
gns-fetch-rules: fixed exception at None fetcher
No longer needed pygit2
Overwrite a HEAD only when necessary
fmod_git: compatibility with git 1.7.x
fmod_git: Using subprocess.check_output() and $PATH
Merge pull request #19 from mdevaev/master

Git scripts