Use poltergeist instaead of capybara-webkit

Also fixes #1983

Remove backward compatibility of factories.

Ensure git can commit and prevent it from failing silently

Update thin closes #1765 and maybe #1051

Conflicts:
	doc/install/installation.md

Update app/views/notify/project_access_granted_email.html.haml

changing wording to sound more better.  

release a new version of grit_ext, added it into Gitlab.

Add pointer about alternative platforms

Turns out git commit returns with 128 when user.name config not present.

Also updated status task and installation instuctions.

Wiki search

API fixes