fix supervisor crash by handling case when st_nlink == 0
Subscribe to 'sessions' by session ID. Get rid of 'session-*' entries in Meteor.Session.
oops, var self
delete old 'sessions' subscription
Add anonymous user test

Creates a grain with a logged in user, and then tests that the a
non-logged in user can access that grain and see its contents as
expected.
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
Merge pull request #177 from jparyani/add-anonymous-user-test

Add anonymous user test
Merge pull request #168 from dwrensha/lstat

fix supervisor crash by handling case when st_nlink == 0
Fix anonymous user test getting stuck on the downgrade info page