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
added new apache cassandra version 1.2.11 as suggested version
Merge pull request #985 from ZaidM/cassandra-node-version-update-2

updated apache cassandra version to 1.2.11
Initial MariaDB entity, largely a clone of the existing mySQL entity.
Merge pull request #986 from alasdairhodge/mariadb

Initial MariaDB entity
bump to jclouds 1.6.2
synch when assigning ports on SSH machines, to prevent race/conflicts
tidy, and allow Map.copyOf(null) to return an empty map (which i think is the common use case)
include both createNode impls in the call path in case either is overridden
remove no-longer-needed special case for jclouds google compute