Fix broken Note scopes with lambdas, 4.0 compat

Without lambdas, Date.today will be evaluated in the class body.
For it to have a running scope of last week etc, it will need to
be evaluated each time the scope is called.
In Rails 4.0, lambdas will be required for all scopes, so not a bad
idea to go ahead and change them all now.

Added autofocus for issue title

Git Smart HTTP protocol runs on `gitlab:gitlab`.

Enable Oauth login for existing regular users

Rewrite build_url, use web_protocol for repo indicator.

Rewrite build_url, use web_protocol for repo indicator.

Explicitly initialize custom port to make the logic obvious.

Secure and httponly options on cookie.

Update author info in tree listing

Fix merging bugs

* Refactor and document methods
* Rename merge to merge!
* Fixes #1544

fix: https://github.com/gitlabhq/gitlabhq/issues/1620

Use gem for Emoji

Code cleanup on NoteObserver and Notify

Fix 500 error when project is empty