ajax busy overlay. redirect hops on load. load pct cloudwatch metric.

- added overlay during ajax calls
- fixed in page alerts
- added redirect hops if an instance is loaded
- added load percent cloudwatch metric
better messages for container resource restrictions

- client side timer to alert user 5 minutes before container is due to expire
- message if container is timed out (detected at both client and server side)
- display memory and cpus allotted to the container and time remaining
- detect port number validity of container during pings (there is still a small chance of connecting to wrong container if OS reuses port numbers too fast)