Merge pull request #261 from maksimov/develop

Added new interface method implementations, added a class type
Merge pull request #262 from maksimov/develop

Default implementations for listProducts(CVirtualMachineProductFilterOpt...
avoid NPE on product filtering
Merge pull request #264 from daniellemayne/develop

avoid NPE on product filtering
incrimental changes
added Snapshot States of SKIPPED and ERROR to cover GCE needs.
folder support
fixed tests
Merge pull request #265 from unwin/develop

Develop
added child folder attribute so we can navigate both directions
Merge remote-tracking branch 'upstream/develop' into develop
Merge pull request #266 from daniellemayne/develop

Develop