switch to using boto's SpotInstanceRequest in backend
add Model metaclass to collect model accessor methods from backend classes
provide SpotRequestBackend with model accessor
add a test for model accessor
Add support for VPCPeeringConnections.
Merge pull request #139 from kouk/backendaccess

general support for access to backend models
Add IAM to README
Turn on threading for Werkzeug's run_simple()

This is now default behavior. Without this, moto is unable to deal
with simultaneous requests.
Merge pull request #159 from ghalib/default-threaded

Turn on threading for Werkzeug's run_simple()
Ignore S3 ACL for now since we do not implement it.
Fix server docs.
Update support for VPCPeeringConnections. (New boto version in Travis matrix and gte threshold for tests.)
First, we make it crash #160
Fix #160, implemented blockDeviceMapping modify_attribute set
Merge pull request #156 from DreadPirateShawn/VPCPeeringConnections

Add support for VPCPeeringConnections.
Add @DreadPirateShawn to authors.
Merge pull request #162 from andresriancho/master

Fix block device mapping #160
0.3.4
Minor refactoring to avoid code duplication
Fix NotImplementedError: The describe_instance_status action has not been implemented #163