[TwitterKit iOS] TwitterKit v3.4.2 Release

[TK iOS] Update TwitterKit and TwitterCore carthage refs

Changes to make Carthage build work locally

JIRA Issues: PUBPL-1463

Differential Revision: https://phabricator.twitter.biz/D110004

Move all scripts out of TC and TK and make sure they work

Summary: Fix build/test script
Fix uploading script
Fix bump version script

Differential Revision: https://phabricator.twitter.biz/D109630