Test for new dependenc to make installator work

After installing mammouth by `npm install -g mammouth` I couldn't run it
```
D:\_work\XXX [master +4 ~1 -5 !]> mammouth --compile --output ./ ./src

module.js:340
    throw err;
          ^
Error: Cannot find module 'commander'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (C:\Users\Cezary\AppData\Roaming\npm\node_modules\mammouth\bin\mammouth:2:15)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
```

This is fixing the problem.