Add IAMInstanceProfile support to launch configs
Improve support for VPC Security Groups in RDS

* Ensures create_db_instance passes VPC args onwards
* Bumps API version so that VPC results are returned in describe calls
Merge branch 'as_config_iam_instance_profile' of github.com:jtopper/fog into as_config_iam_instance_profile

Conflicts:
	lib/fog/aws/parsers/auto_scaling/describe_launch_configurations.rb