Removing oauth2 library, will relink using our fork.
Removing borismus' oauth2-extensions submodule

Will replace with our own
Adding forked version of oauth2-extensions
Doing a little house-cleaning.

- Removed callbacks that werent doing anything.
- This will be broken until the next commit.
- The pretty printer uglified this...
Moved the authorization button behavior into the Authorization js.

- Pretty printed file, too.
Callbacks should be optional.

Unbreaks prior commit
Pass the domain into the oauth adapter.

This will now use our modified version of the OAuth2-Extensions repo.
- Pretty printer kicked in again..
Pointing to phabricateme branch

- Contains a modification that allows adapters to access additional configuration data.
- Contains the phabricator OAuth2 adapter.
Removing background page settings, since we're not using it right now.
Adding oauth2 dependencies into extension/

This part's a little tricky since its not symlinked (the extension cant see the submodule).
We may revisit this later.