Updated version for next release cycle
Add the new generation ec2 instance types
Add jcl0over-slf4j to default dependencies in readme
Update release configuration
Update to pallet-aws-ops 0.2.1
Make provider work on non-default VPC

Use security group ids rahter than security group names.
Updated project.clj, release notes and readme for 0.2.4
Merge release/0.2.4