add twitter
modify unit test
add twitter
fix unit test
Merge pull request #19 from shimokitabenbot/add_tweet

Add tweet
fix tweet_controler
Merge pull request #20 from shimokitabenbot/fix_tweet_controller

fix tweet_controler
fix search controller
Merge pull request #21 from shimokitabenbot/fix_search_controller

fix search controller
Merge pull request #22 from shimokitabenbot/develop

Merge to master