Added the ability to grab a Timer from the metrics service
Initial implementation of per-filter processing time metrics
Refactored the implementation using a Timer
Fixed a unit test
Fixed a typo
HashMap for individual filter timer metrics, TimerByCategory setup
Added TimerByCategory, used it to implement filter processing times
Modified RequestTrace and PowerFilterChain to record accurate delay metrics and reduce redundant code, added simple test skeleton
Upated functional test for precision
Added basic unit tests
Consistency
Removed dead comment
Changes to make code clearer and more appropriate
Fixed: x-route displaying on trace request in place of the filter name
Cleaned up the traceExit call
Updated in response to pull request comments
Merge pull request #740 from dmnjohns/timer-metrics-merge

Instrumented Per-Filter Processing Time Metrics, Implemented TimerByCategory Metrics