phabricator has gotten rid of javelin as a subrepo.  Yay!  We will too.

Summary:
c.f.
   https://github.com/facebook/phabricator/commit/07767fda00ab4437127ce95aae451632b2b55798

Reviewers: benkomalo

Reviewed By: benkomalo

Differential Revision: http://phabricator.khanacademy.org/D1068