Class used to launch the interpreter.
This is the main class as defined in the jruby.mf manifest.
It is very basic and does not support yet the same array of switches
as the C interpreter.
Usage: java -jar jruby.jar [switches] [rubyfile.rb] [arguments]
-e 'command' one line of script.
GC (Garbage Collection) Module
Note: Since we rely on Java's memory model we can't provide the
kind of control over garbage collection that MRI provides.