Add parameter support when executing queries
Remove conflicts for compatibility with older postgres installs
Remove buffers_backend_fsync for compatibility
Don't log false-y values
Override publish method to skip falsey or 0 values
Set 'postgres' as the default database if none is specified
Changed elasticsearch collector not to blow up if CPU, memory or file stats are not present in the JSON response (e.g. due to access rights of user running elastic)
Used _add_metric wherever applicable in elasticsearch collector
Final use of _add_object wherever appropriate in elasticsearch collector
Fix a stacktrace when the directory does not exist
Disable the NagiosPrefData Collector by default
Fix a stacktrace on missing libvirt
Fix stacktrace from missing vms
Add network_timeout option to mongodb collector.

No timeout by default to maintain backward compatibility.
+ windows fixes
= wrong unit at least on windows these are bytes not bits
= windows fixes
+= default no collector enabled => too many will not work anyway
= windows seems not to support nice cpu values
= used is wrong
= does make no difference, if calcuated or directly used