temporary fix; start fxa-auth-db-mem server for fxa-auth-server to use
clone all of fxa-auth-server
Merge pull request #1451 from jrgm/fxa-auth-db-mem-startup

temporary workaround for travis failure; checkout an earlier version of fxa-auth-server

This gets my seal of approval, going to issue a follow on PR that reverts this for when the auth-server is fixed.