* The open_id_authentication plugin will require the gem automatically so
  it doesn't need to be added to environment.rb
* Changed the version requirement on the open_id_authentication to match
  the latest stable version.  Rails config.gem looks for a directory named
  after that specific version and will not load newer versions.

  #699

git-svn-id: https://svn.redmine.org/redmine/trunk@2452 e93f8b46-1217-0410-a6f0-8f06a7374b81