Added OAuthSwift.
Added credentials.plist with consumerKey and consumerSecret.
Checked authentication with the app's client key and secret.
Added ClientGenerator which carries out OAuth if needed and reurns a OAuthSwiftClient.
Changed foo () -> () method signature to foo().
Added Authenticator, RequestHandler, ClientGenerator and UI etc.
Fixed typo bugs.
Fetching Tweets.
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Merge pull request #1 from heresamit/tweet_view_controller

Tweet view controller