Upgraded devise-remote-user to v0.3.0.
Added DeviseRemoteUser.logout_url setting
Removed #after_sign_out_path_for from ApplicationController.
Included DeviseRemoteUser::ControllerBehavior in ApplicationController.
Merge pull request #716 from duke-libraries/devise-remote-user-030

Upgraded devise-remote-user to v0.3.0.