feature: allow tweeting bounties on creation

WIP: mostly done, still need tests and probably some fixes
fix: push tweets on every share/feature (not on user's request)

also, propogate request from view to tweet handler
tests: add tweet flow test and mock all calls to send_tweet
tests: remove unneeded calls in setUpClass
Merge pull request #15 from asfaltboy/twitter_publish

Merge Feature: Twitter publish