Update twitteroauth for API v1.1, minor fixes

Recently Twitter discontinued version 1.0 of its API in favor of version 1.1. This commit introduces
the patches made at https://github.com/abraham/twitteroauth to allow tweeting again.

In patchset 2, minor edits were made to CommunityTwitter_body.php to improve functionality. Proper
deletion POSTs and deleted tweet splicing were introduced, along with better handling of form URLs.

Change-Id: Ie7f2aa7a5875c1e9636f40156d314d6d4c420d0e
Merge "Update twitteroauth for API v1.1, minor fixes"