Nagios Plugin to monitor MongoDB servers

* Check Connection
* Check Percentage of Open Connections
* Check Memory Usage
* Check Mapped Memory Usage
* Check Lock Time Percentage
* Check Average Flush Time
* Check Last Flush Time
* Check status of mongodb replicaset
* Check status of index miss ratio
* Check number of databases and number of collections
* Check size of a database
* Check index size of a database
* Check index size of a collection
* Check the number of queries per second
* Check Primary Connection
* Check Collection State
* Check Replication Lag
* Check Replication Lag Percentage
* Check the primary server of replicaset