Feature/notification

- replace ServiceJettyAvailability condition with default process_running condition
- added service up and service flapping watch in God
- added notification triggering in God
- updated chef script to set up secure tunnel to aws email server
- updated chef script to replace variables in jvm_heap_usage.god.rb.erb (e.g., smtp user/password)
- updated chef script to use install God through gem (apt-get has only the very old version)