Added git install for tsung so we can test WebSockets.

Bumped node to 0.10.17 for local and performance.
Erlang before tsung::install::git
Added the /api/push block to the nginx config.
Using activity-cache0 directly
Added sufficiently long timeout in nginx for push endpoint
Add munin in the performance environment.
Allow indexes to be shown for munin.
Increase nofile limit