Improve the injection process (source maps)

[markfinger]

Currently we either inject elements pointing to assets or eval them with inline source maps. Might want to consider merging and streaming down JS/JSON assets with offsets.

Ref: https://github.com/facebook/react-native/blob/ea882b6f161409ff439b93dfa146431944a42d9d/packager/react-packager/src/Bundler/Bundle.js#L199-L232

[markfinger]

Incidentally, babel's added source map support for something approaching bundling: https://github.com/babel/babel/pull/3323/files

Probably not of relevance, but it's worth being aware of.

[markfinger]

#111 is another possible solution