add a first failing unit test for keypairs
return empty key pairs response
add test for create_key_pair
create KeyPairBackend in ec2 model, use in keypair test
implement test for create_key_pair
add test for creating already existing keypair
make duplicate key pair test pass
test DescribeKeyPairs with more than one key pair
implement delete_key_pair, test zero case
test for delete_key_pair
really delete key pair
support names in DescribeKeyPairs
raise NotImplementedError when Filters are used in describe_key_pairs
Merge pull request #101 from kouk/keypairs

Basic support for KeyPairs