Write few tests for Network params encoding and address creation.
Rake file also run the tests for Twitter::Network.
Add Integration test for Timeline happy path.

- Fix the problem in TwitterNetwork for URI creation.
Hid Network interaction in Mention timeline.
Hide network interaction in Retweets.
Remove user data from cursor. It's being fetched direcly by parser.
Use each_with_object for collecting friends latest tweets.
Rename extract_and_add_friends to add_friends_to_user.
Apply some Refactoring.
Add last_friend test file which contains last friend data.
Move fetching friends code to Following where it belongs.
Add test for fetching latest tweets of friends.
Refactor and Clean up.
Rearrange the directory structure of the project.
Use RSpec Rake Task now.
Add Gemfile.
Stop fetching friends as soon as there's a error.