Bugfix for mysql_grant provider when we try to grant remove privileges
on PROCEDURE. Resolve for bug https://tickets.puppetlabs.com/browse/MODULES-130
(https://github.com/puppetlabs/puppetlabs-mysql/issues/378)
Add system test to cover procedure creation scenario
Remove duplicate service_provider description

The `service_provider` parameter was explained in the README twice, so I've removed one of them.
Merge pull request #421 from lboynton/patch-1

Remove duplicate service_provider description
Merge pull request #412 from n1tr0g/master

mysql_grant fixed to properly handle PROCEDURE grants