Added username attribute cloud register method.  This allows for username to be used automatically to name vm's and disk's to ease confusion in development cleanup efforts.

Works in conjunction with update to daesin-cloud-test and daesin-compute-google
Merge pull request #167 from TheWeatherCompany/develop

TWC changes
Merge pull request #169 from unwin/develop

Added username attribute cloud register method.  This allows for usernam...
Fixed javadoc for VirtualMachineSupport#modifyInstance. Provided default implementation for modifyInstance in AbstractVMSupport to avoid compilation failures in implementations.
Merge pull request #170 from maksimov/develop

Tidying up for VirtualMachineSupport#modifyInstance
Merge pull request #62 from greese/develop

Dasein upstream changes