Ability to detect cluster services installed. Updated error message for incorrect zProps.

Still need to handle cluster detection by creating new device with cluster ip if not already
created.
Provides support for new cluster device. Also better handling of error messages.

This update will create a new device if it doesn't already exists in the
Microsoft/Cluster device class.
-- Still need to create cluster modeler that will be assigned to this class

Also provides error event when SQL modeler plugin is enabled but SQL is not installed.
Merge branch 'develop' of github.com:zenoss/ZenPacks.zenoss.Microsoft.Windows into feature/cluster
Fixes for perf counters and systems without cluster installed.
Updated version
Fixed issues with except statements. Started support for inter device object linkage for clusters.

- Still need to get the link object working for cluster
Working Cluster link on hosted server.
Merge pull request #53 from zenoss/feature/cluster

Cluster detection and minor bug fixes