adding - get all certificates, get certificate, and upload certificates endpoints
switch to using boto's SpotInstanceRequest in backend
add Model metaclass to collect model accessor methods from backend classes
provide SpotRequestBackend with model accessor
Route 53 GET request honors the Name parameter.

Now record sets can be retrieved by name via get_all_rrsets.
Fix retrieval of autoscaling group instances.
Merge pull request #147 from mrucci/route53-get-by-name

Route 53 GET request honors the Name parameter.
Merge pull request #148 from mrucci/fix-describe-asg

Fix retrieval of autoscaling group instances.
adding ability to delete elb listeners
adding tests
Merge pull request #150 from kevgliss/enhanced_ssl_support

Enhanced ssl support
Remove dupe line.
Add @kevgliss to authors.
0.3.3
Updating dynamodb2 tests for newer boto.
Fix travis config.
Restrict tests to new version since we have change the behavior.
moto-152 - return vpc.id if exists else return nothing
Merge pull request #153 from colinbjohnson/moto-152

moto-152 - return vpc_id if exists else return no value (None)
add a test for model accessor