Add rnpm support

[peritus]

I like this library, but adding a cumbersome manual step to installation adds a high burden for getting reproducable builds and conistency among developers in my project.

Would it be possible to add support for rnpm (http://www.reactnative.com/react-native-package-manager/) , so that rnpm link does what's currently described in the screenshot in the README ?

[kkjdaniel]

Noticed your pull request, will review it soon, we have made some updates to the .m / .h recently.

[jwhitley]

+1

[lopezjurip]

+1

[dannolan]

+1