Summary:
This PR gives RNPM the ability to look for plugins in `scoped` modules.
The regexes for finding RNPM plugins will match these hypothetical examples:
* `rnpm-plugin-foo`
* `org/rnpm-plugin-foo`
The regexes for finding React Native plugins will match these hypothetical examples:
* `react-native-foo`
* `org/react-native-foo`
* `The controller you requested could not be found./module` (will be useful in the slimmening)
* `The controller you requested could not be found./module`
RNPM plugins will be able to benefit from this immediately, but React Native plugins will run into this Metro issue currently:
https://github.com/facebook/metro/issues/241
Pull Request resolved: https://github.com/facebook/react-native/pull/21082
Differential Revision: D9809094
Pulled By: hramos
fbshipit-source-id: 4b0694ad4119b37dd5664af52c48e48ebe4d7404