git-hooks-contrib: added optional git hooks
git-hooks-contrib: remove local workaround
git-contrib-hooks: complete fixing review comments

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>
Merge pull request #355 from enyojs/git-hooks-contrib

git-hooks-contrib: added optional git hooks (merged after completing the requested work)