Add -l, --linked

[Fishrock123]

The relevant code can be found at

rustyduk/src/bundler.rs

Lines 35 to 53 in 3797dd1

	if zip_only {
	println!("Creating plain zip");
	} else {
	let exe = env::current_exe().unwrap();
	println!("Embedding nucleus from {}", exe.to_str().unwrap());
	let mut file = File::open(exe).unwrap();
	let mut buf: Vec<u8> = Vec::new();
	match file.read_to_end(&mut buf) {
	Err(err) => { panic!(err.to_string()) }
	_ => {}
	}
	match writer.write_all(buf.as_slice()) {
	Err(err) => { panic!(err.to_string()) }
	_ => {}
	}
	}

The zip_only bool will need to change to use a struct passed from the options parsing and example of what it needs to prepend to the zip bundle can be found in the c impl: https://github.com/nucleus-js/seaduk/blob/master/src/main.c#L390-L395