add filtered metrics implementation
Merge pull request #39 from alhardy/dev

added http method to owin metrics name
fix test scheduler firing to often
cleanup EDR tests
Extract interface for reporters
change reservoir interface to allow resetting the reservoir
Cleanup Metrics namespace - move Metric Value related code to MetricData namespace
add description comment for tags
move more metric data related classes to MetricData namespace
add command line options to stupid benchmarks
use interface in reports registration
have timer depend on Histogram & Meter Implementation interfaces
move histogram count to the reservoir & snapshot
make snapshots sealed classes as they don't need to be structs
values for timers, meters & histograms don't need to be structs. switch to using sealed classes
add sample, meter resetting report
handle double.NaN as quantile value (ported from java lib)
ported more tests for weightedsnapshot
minor formatting
added doxygen config