Added Instagram Functional Tests

  - Also Added helper for the check url test
Fixing Access URL Bug

  - Noticed while writing tests!
  - Getting request token was being done two separate times. Once during
    get access_url, and once for getting request_token.
  - This led to the request tokens in the session not match the ones twitter
    wanted
Adding Twitter Auth Functional Tests and Factories
Adding Access_Token Method to Twitter Auth
Adding VCR Cassettes for Twitter
Adding Twitter Functional and Unit Tests.

  - Also adding Oauth::Client comparator helper
Merge branch 'twitter_testing'

Conflicts:
	test/functional/authorizations_controller_test.rb