Added test for the FlowdockService.

Before we have only owner_id to determine group owner
With multiple owners per group we should get rid of owner_id in group.
So from now @group.owner will always be nil but
@group.owners return an actual array of users who can admin this group

* Hooks and team pages allowed only for masters/owners
* Group page allowed for admin
* Corrent authentication for Projects controller
* Hide some project elements from visitor

GITLAB-1262

Change-Id: I690cb8ea294df53ebe8405a519c23c501af2c21a

Conflicts:
	app/models/user.rb
	config/initializers/1_settings.rb
	spec/models/user_spec.rb

Change-Id: Ia723321a5cb05deb626d34c7d8d78194e049b1f0

Change-Id: Ib4eb533dff5c722fe559330e4aa71b5d5baf6fb8

-calling build_user will now apply defaults and only override them if as: :admin is set

Change-Id: Id1d938c0967752ecc14370af54f2d88128d18c44

-API now respects default_projects_limit, default_can_create_group, and default_can_create_team

Change-Id: I059d060d576df1050e5371e707381c5e8c608a7a

Change-Id: I305266fe9acbbb5136adeeb52e7e4e1d6629a30a

Previously, only number of changed files mattered. Now, number of lines to render in the diff are also taken into account.

A hard limit is set, above which diffs are not rendered and users are not allowed to override that. This prevents high server
resource usage with huge commits.

Related to #1745, #2259

In addition, handle large commits for MergeRequests and Compare controllers.

Also fixes a bug where diffs are loaded twice, if user goes directly to merge_requests/:id/diffs URL.

Show permissions for all project.
Add ability to remove user from group if not an owner
Remove unnecessary admin controller

Provide UI with explanation what happens when you block or remove user
When remove user - remove all groups where user is an only owner

When block user - remove it from joined groups
Dont remove user from own resources (groups, users)

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