Moved to tweepy, added tweet text wrapping

Moved to tweepy to support updating description and profile picture changes. As of now, ewb indicates in its description "ONLINE!" when script is running and "OFFLINE." when script is terminated.

Further additions could include different profile pictures for online/offline states (e.g. day and night)

Further, text wrapping support is updated. If the response to a question exceeds 140 characters, the tweet will be broken up into multiple tweets and update_status will be called multiple times. Each tweet will be prefixed with @user.screen_name. This is done using the textwrapping module.