git hooks support

[Faryshta]

It would be nice to have git hooks handling the following events

• pre-commit: execute hidev fix and prevent the commit if this command returns failure.
• pre-push: execute hidev test and prevent the push if this command returns failure.
• post-merge: check if composer.json or composer.lock got updated and execute composer update.
• commit-msg a configurable event to handle if the commit message is valid. For example require the commit to contain [enh], [fix], [bug], [docs] tags.

[hiqsol]

'hook' action can be added to GitController to create all configured hooks. Configuration should look like:

git:
    pre-commit: fix
    pre-push: test

Then hooks are installed with hidev git/hook command.