js -> ls

cmd.js should be generated by lsc.
npm tries to chmod to cmd.js before we create it. so we will get
this error message.

    npm ERR! Error: ENOENT, chmod
    '/path-to/api.ly/node_modules/pgrest/bin/cmd.js'

since we already chmod manually (by scripts@package.json), we don't
need this instruction actually. workaround it!