avoid error when TeamCity does not return any builds
Bump githubot version on all scripts.

There shouldn't be any backwards incompatibilities, and I tested most of
these cursorily. Will fix a few bugs.
Merge pull request #1151 from bhcleek/master

avoid error when TeamCity does not return any builds
Update github-merge to use new githubot merge API
Merge pull request #1152 from iangreenleaf/update_githubot

Updates for latest version of githubot