Run Agent script locally needs JSR 223 ScriptEngine support

[fcohen]

The Agent drop-down menu, Run Agent Locally function currently expects that the script is always going to be a Jython script. This function needs to use the JSR 223 ScriptEngine? (in Java 6) to dynamically determine the script language type and use one of the ScriptEngine? implementations (Groovy, JRuby, etc) to run the script locally.