Fix WebHook and special symbols in credentials

Add title for "Remove from team" button

Add transition on search box

It's kind of cool trend to use animated-expanding search box nowadays.
E.g. see Github.

When using web hook with credentials secured web resource, one needs to
put the credentials in the hook URL.

If the credentials contain special symbols (e.g. @ or #), it should be
URL-quoted (e.g. %40 instead of @).

But when Gitlab is making a request, it should unquote the symbols
before base64-encoding them.

Fix RESTfulness of project hook deletions by API

API: creating last project before limit returns 404

API: fixes visibility of project hook

Add commit full time tooltip to `commited_ago`

Update doc/install/installation.md

Update seeds for state columns

changed installation overview list step #4
Gitolite -> GitLab shell 

Event already has author relation

Fix development fixture for gitlab_shell