Added support for JIT deployment of implicit chains. Primary testing done

Added instrumentation to measure worker idle time before it receives its first request. 
Also added flags related to JIT deployment

Support is only for non-conditional chains.

Better support for different runtimes added

Conditional chain support added for Explicit chains. This introduces probabilistic chain support to Xanadu.

Added support to save long term metrics to couchDB

Support added for explicit function chains via a map file. 
Static map support added - map provided during deployment added
TODO: add support for dynamic maps during request

Support added for multi-function deployment