Extended the parser to support optional paretheses for methods called with only one argument;

Example:
	class Test() {
	    method output(arg) {
	        say arg;
	    }
	};

	var obj = Test();
	obj.output "Hello";	# now, this works

	## Also, more examples would be:
	Sys say "Hello";
	Sys->say "Hello";
	Sys.say "Hello";	# all interpreted as: Sys.say("Hello");