Sinatra OmniAuth Demo: Using Facebook and Twitter

To Run:
1. Set your facebook and twitter app settings in config.yml
2. bundle install
3. run app: unicorn -p 3000
4. browse http://127.0.0.1:3000/

NOTE: 
a) Twitter doesn't allow app domain as localhost, so set 127.0.0.1:3000 as your app domain.
b) In application settings set callbacks to /auth/:provider/callback # :provider = facebook or twitter
c) I like to run on port 3000 you can run any as you wish just set it everywhere.
d) OmniAuth allows other authentication providers here's a list: https://github.com/intridea/omniauth/wiki/List-of-Strategies
e) If you have rack 1.4.0 installed and app isn't running try downgrading rack to 1.3.6


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