remove react from npm disctribution

[vaukalak]

when installing from npm, there'e a directory node_modules/es6-react-mixins/node_modules/react/.

This cause @provideModule duplication issue (at least with react-native).

[angus-c]

this is expected and necessary - react is required by mixin.js

[vaukalak]

@angus-c you should add it as dependency in package.json. ok I'll fork that and will try to show you an example.

[angus-c]

It is already a dependency

  "dependencies": {
    "babel-runtime": "^5.8.25",
    "react": "^0.13.3"
  },