function minifyBundle( bundle ) {
		debug( 'Minifying...' );
		bundle = uglify.minify( bundle.toString() );
		debug( 'Finished minifying bundle: %s', b.name );
		debug( 'Minification errors: %s', ( bundle.error ) ? bundle.error : '(none)' );
		writeBundle( LICENSE_HEADER+bundle.code, true );
	}
Minifies a bundle and writes the bundle to file.

@private
@param {(string|Buffer)} bundle - bundle to minify