Add ready? method to aws VPC and Subnet models
[rackspace|queues] adding the queues getting started guide
openstack modifications

* add model and collection for security group rules
* add mock data for networks
* returns address in create_server mock
* proper security group rule mocks
* proper security group mocks
[rackspace] apply documentation edits
Allow custom Mock.not_implemented message
Add pending -> available transitions for AWS VPC and Subnets
Merge pull request #2466 from sugarb/vpc_and_subnet_ready

Add ready? method to aws VPC and Subnet models