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Remove potentially out of date or specific product references.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
EC2 Security Group - Validate parameters.
ec2_group - Cleaner param validation check.