Add kibana, visualize logs and time-stamped data
pythonPackages.graphite_influxdb: use latest version from master

Latest version is needed if you want to run this in production, because of
some fixed performance bugs.
grafana: update 1.5.4 -> 1.8.0-rc1
nixos/graphite: add host and port options for graphiteApi
nixos/mongodb: service fixes

- Log to syslog, so journal picks-up logs
- Start as foring service, so systemd will wait for service to start
- Add extraConfig option
rubyLibs: add compass, regenerate
rubyLibs: fix bundler