Add WindowsPerformanceCounterFeed

Allows multiple Windows performance counters to be fed into Brooklyn sensors.
Template release notes.
Removed spurious reference to byon
Fixed tearDown issue with already-released machine
Merge pull request #984 from Nakomis/fix-single-machine-location

Fix single machine location
Merge pull request #982 from jdtoy/template-release-notes

Release notes for SNAPSHOT.
Merge pull request #968 from richardcloudsoft/windows-perf-counter-feed

Add WindowsPerformanceCounterFeed
Initial MariaDB entity, largely a clone of the existing mySQL entity.