Added a monitor for checking if a process is running

Added a monitor where a process name is specified, and the monitor will check to see if the process is currently running.

Will only work in Unix systems.
Better handling of incorrect input strings
Update servicemonitor
Added an example of how to use the Process monitor
Can now specify the smtp server's address and port in environment variables
Fix for default value set for min
Merge pull request #2 from RyanFrench/master

Added the Process monitor type