add check for the number of messages in postfix mail queue
add ability to check for minimum number of messages in a queue
Merge pull request #190 from jlambert121/postfix_mailq

add check for the number of messages in postfix mail queue
extra blank line removed
ensure over or under checks can be used without setting both
Merge pull request #231 from jlambert121/sqs_update

add ability to check for minimum number of messages in a queue