service cleanup
Escape % in db+table names before adding to a format string being passed into db.execute()

Fixes #416
Misc EC2 doc tweaks.
More EC2 doc tweaks
Remove potentially out of date or specific product references.
Merge pull request #346 from bcoca/service_cleanup

service cleanup
Add ec2_vpc_igw module.
ec2_vpc_igw - Exit with fail_json when boto is unavailable.
ec2_vpc_igw - Rename IGWException to AnsibleIGWException.