Removed delegator facility on the Sink interface.
Rescuing and logging any exceptions raised to the telemetry
error log
Removing tags from git
Changed annotate api on trace/span to accept a pair of strings
Instrumentation for rack/zephyr
Tracer now calls start/stop on the current span which in
turn logs start/stop times
Added start_new_span method to Tracer's API
* starts a new span and makes it the current span
* adds the new span to the tracer's span stack
Rack component works with tracer api
Attach a default annotation to a span e.g. with service name
Config can now read from a yaml config file
* Removed ErrorLogger class in favor of a class method on the Loggers
module
Runner object config is a stringified hash
* converted all config symbol keys to strings
Changed config log info to be a single filename including
directory