HipChat notifications for website-commit and update-translations

Summary:
website-commit notifies the "1s and 0s" room, the global default.

update-translations notifies the "i18n" room.

Test Plan:
Configured on jenkins.khanacademy.org first, then ran
./fetch_jenkins_config.sh to pull changes for commit.

Reviewers: csilvers

Reviewed By: csilvers

Differential Revision: http://phabricator.khanacademy.org/D2597