Update README.md

Remove reference to authenticated referrals as these are being removed from the Facebook platform on Feb. 6th, 2013 per the FB developer blog.
Update README.md

Fix link.
fail! if there is no 'code' parameter or 'fbsr_' cookie in the callback.

Includes tests for #signed_request.
Don't try to parse the signature if it's nil
Merge pull request #117 from nchelluri/master

NoAuthorizationCodeError and NotImplementedError will now 'fail!'
Merge pull request #127 from oriolgual/fix_nil_signature_value

Don't try to parse the signature if it's nil
Merge pull request #99 from weyus/master

Modify README to remove reference to authenticated referrals, which are on their way out.
Update helper.rb
Add locale parameter
Merge pull request #132 from seivan/master

Update helper.rb to use Minitest::Test
Merge branch 'locale_parameter' of github.com:donbobka/omniauth-facebook
Test locale option.
Update README.md

[ci skip]
Add 2.0.0 to Travis config.
Update README.md

closes #95
Update Gemfile

use secure rubygems source
fix CSRF vulnerability. prepare 1.5.0 release
fix CSRF vulnerability (cherry-picked from 1-5-0-stable)

Conflicts:
	lib/omniauth/strategies/facebook.rb
	test/support/shared_examples.rb
	test/test.rb
build all branches in travis
trigger travis CI build