Subscribe to 'sessions' by session ID. Get rid of 'session-*' entries in Meteor.Session.
oops, var self
delete old 'sessions' subscription
Change Dockerfile to cache gtest

We were seeing intermittent problems with gtest's source going down, and
this commit will change to us caching it.
Merge pull request #175 from dwrensha/sessionId1

Subscribe to 'sessions' by session ID
Merge pull request #178 from jparyani/cache-gtest-docker

Change Dockerfile to cache gtest