Add regex support for stop, restart. 

Ideal for stopping subsets of scripts run with certain kinds of arguments, e.g.

    forever stop "/app.js 801[4-9]/"

will stop all app.js instances that listen on ports 8014 to 8019

Implementation: if the parameter of findByScript begins with '/' then the expression is treated like a regex to be applied to "[command] [script] [arguments]"

Perhaps this is not the cleanest way to do it. Suggestions?