Fix for issue 5044

Fix for issue 5040

Fix for issue 5090

Update gems

Update to Rails 4.1

Fix for issue 5044: Adding tabindex attributes for add contact dropdown and contents, also binding keypress event to perform same action that click does.

Adding scope for account_deletion to get only those that are uncompleted and then adding that scope to accounts.rake. Tested it out and it works well

Fix for issue 5040: Adds completed_at column to account_deletions and sets timestamp upon successful completion. Depends on uniqueness of diaspora_handle when combined with person_id