Remove separate react-native package

[Jyrno42]

We created a separate package for react-native as a workaround since there was some collision inside the packager. Since this causes issues with automated deploys, and theres a reference fix available now lets implement it.

More info available at:

• GraphQL babel transform collides with react-native packager graphql/graphql-js#414
• graphql/graphql-js@188881b

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• Remove release script
• Support for jsnext:main & module fields
• Reduce babel requirements
• Test inside react-native (cd into source dir npm link, cd into test-project dir, npm link tg-resources)

[Jyrno42]

Since we now have esnext build available we can just use that as package.json:react-native value. This ensures we need only as little of babel-runtime as possible (since our build is es2015).

Leaving the issue open until the following is completed:

• Update README (remove/replace react-native block)
• Release tg-resources@2.0
• Deprecate all tg-resources-react-native packages in favour of tg-resources@2.0