Updates to loading an hvm image. Allow custom params for register request to test 'Platform'. Clean up euproperties.
Pep8 clean up
Create euca2ools wrapped register test method
Add lxml to requires for manifest parsing
Update wget for Machine(), update image utils with additional euca2ools wrappers, add install script for imaging service
Merge pull request #264 from bigschwan/testing

Test units to configure imaging service and install hvm image