Changes to support RDS for GCE
Merge pull request #235 from maksimov/develop

Develop
Merge pull request #234 from unwin/develop

Changes to support RDS for GCE
Addition of detatchHealthCheck method
Merge pull request #238 from unwin/develop

Addition of detatchHealthCheck method
Add abstract method for detach HCs
Merge pull request #239 from andylyall/develop

Add abstract method for detach HCs
Add VisibleScope to LBs
Add Naming Constraints to VolumeCapabilities
Merge pull request #240 from andylyall/develop

Develop
Added listSpotVirtualMachineRequests method call with it's supporting filter options class.
Merge branch 'develop' of github.com:maksimov/dasein-cloud-core into develop