Support added for speculation aggressiveness parameter for explicit chains

Reduced complexity of the speculative deployer. Moved path discovery to orchestrator. Removed need to recalculate path on each run

Support added for deployment aggressiveness parameter for implicit chains

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

Added support for measurement of call delays in implicit function chains

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.

Moving metrics handling to Prometheus from swagger stats.

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