Wavefront Libraries 4.9

Proxy: allow point tag values to start with a digit without having to wrap them in double quotes
Proxy: allow 1 letter/1 digit point tag values without having to wrap them in double quotes
Proxy: consistent naming for histogram-related configuration properties in wavefront.conf
Proxy: suppress "Connection reset by peer" warning messages on receive to prevent log flooding
Proxy: detect duplicate instances
Proxy: fix a bug with day-level histograms triggering an exception
Proxy: track configuration settings as ~agent.config.* metrics
Proxy: restore original settings for pushFlushInterval, pushFlushMaxPoints and retryBackoffBaseSeconds when not controlled by the collector
java-lib: fix bug where WavefrontHistograms were not reused from a metrics registry
java-lib & yammer-metrics: Add plug-in metric transformer to JSON reporting.
java-client: Try to reconnect on broken connections before throwing an exception