Merge pull request #27 from clstokes/develop

Develop
Merge pull request #28 from clstokes/develop

Added filter support to listImages(..) on MachineImageSupport w/ ImageFilterOptions.
Added support for new SubnetCreateOptions approach to subnet provisioning and added subnet tags
Removed a call to a deprecated method
Refactored to use abstract image support and rename MachineImagefilterOptions
Removed method that was made final in super-class
Incorporated extended filtering
Optimized filtering a bit
Addressed a model change