Merge pull request #19 from clstokes/develop

Added providerKeypairId and providerFirewallIds to VirtualMachine model.
Fixed pom.xml from pull request
Fixed a bug in which sometimes AWS wasn't fully consistent with a newly created image (issue #21)
Added support for getting backend server status from a loadbalancer.
Updated to reflect object model changes
Merge branch 'develop' into loadbalancer-serverstate