Create binary libraries for natives modules on distribution

[icc-romeu]

For native modules, it might be very useful to distribute the iOS/Android side in a binary library (aar/pod) so end users do not have to deal with compilation. Moreover, it can be a good idea if you are distributing some kind of private development and do not want to share the native source code.

P.D.: thank you for such a great tool. We use it a lot in our daily work.