handle attahcment with send_file
API: tests to show incorrect behavior when reaching project limit

When reaching the project limit the API returns an error code 404 on the last possible
project. The project itself is created and is available in the database (seems valid).
A similar behavior can be observed when reaching the project limit via web client, but
in this case the user is notified that the maximum number of projects is reached. The project
itself is still created and can be accessed.

Tests are added to check the behavior when reaching the project limit or one tries
to exceed it via the API.
API: fixes return code when creating last project before reaching limit

When creating the last project via API when reaching the project limit a status code
of 404 (Not found) is returned instead of 201 (Created). The fix checks now correctly if
the project could be saved.
API: refactored last fix, project limit in web client is fixed too

The previous call `saved?` is restored in the `POST /projects` method in the API.
It is refactored to check if the record is persisted. This is useful to not validate
the record again after saving. This fixes the returned status code in the web client
too. If the last project is created via web client instead of error notification
the project page is shown.
Change .gitignore to ignore logrotated log files.
Add option to disable username changing

This option allows to disable users from changing their username.

This is very usefull in environments using strong internal authentication methods like ldap, pam or shibboleth.

You can allow users to change theyr username in these environments, but then new users (users loging in first time) is blocked from gitlab is her username exists.
rename setup to setup_db so that it does not collide with gitlab:shell:setup task
Remove hardcoded refernce to gitlab-shell home. so that gitlab can be installed on any unix account other than git
skip protection to aws3
Per project protection
Fix ssh key fingerprinting test to use exitcode
Fix file_name for archive
Fix file_path to correspond with the name
fixed API access to the project
Merge pull request #3003 from livedata/patch-1

fixed API access to the project
Merge pull request #3002 from nafu/repo_patch

Fix file_name for archive
Merge pull request #2994 from dasbh/master

Fix gitlab:setup task on fresh installation
uppercase Gitlab version and revision constants. check api return gitlab version now
Merge branch 'features/attachment_server' of /home/git/repositories/gitlab/gitlabhq
API: fixes visibility of project hook

When a user is not authorized to see the list of hooks for a project, he is
still able to access the hooks separately. For example if access to
`GET /projects/:id/hooks` fails and returns a `403 Unauthorized` error it is
still possible to access a hook directly via `GET /projects/:id/hooks/:hook_id`.

Fixes access, also added tests to check access and status codes of hooks.