[hhvm] remove session serialize handler hack
Fixed a memory leak when a connection is closed the topics should also be removed if they are empty
Merge branch 'refs/heads/easen'
[Sessions] Attempt to set ini vars for CI to fix HHVM
[Sessions][HHVM] Another attempt to pass CI tests
[tests] Added hhvm-nightly to travis builds
[tests] Removed hhvm-nightly due to build error
Merge branch 'refs/heads/hhvm'
Merge branch 'github-master'