Stop using `Rails.env.test?` in views.

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Deploy keys were added with write access to
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7383 - We still
state " Deploy keys allow read-only access to your repository." in the
UI.

This updates the deploy key UI information to reflect the docs
https://docs.gitlab.com/ce/ssh/README.html#deploy-keys

Also fixed the deploy_keys view and moved the code from the repository_helper
to the repository_controller

Added specs for the deploy_keys_presenter and added a new method in the presenter
called #key_available?

Fixed some minor UX inconsistencies and added a concern to handle
redirection

Also modified the render calls to the deploy_keys and protected_branches
partials

Changed views to partials, created the repository view,
created a repository_helper to further aid the creation of variables
across different controllers

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

In another MR, the class name was changed making all the alert messages have no background color

Closes #13992

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Make the following changes to deal with new behavior in Rails 4.1.2:

* Use nested resources to avoid slashes in arguments to path helpers.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Summary:

 - Mostly very small things involving use of "a", "the" etc.
 - "post-receive" hooks are usually written with the hyphen in the name .
 - I changed the Web Hooks page to have a title consistent with all the other
   pages in the settings area.
 - More consistent usage of full-stops in lists.