Summary:
Exposes the dev option that is already there to the CLI so that you can turn off invariant checks, etc. I also made it omit the inlined source map when dev=false which made it a lot faster to run on a phone, both due to smaller download size and fewer bytes to copy from Obj-C to JS and evaluate.
Closes https://github.com/facebook/react-native/pull/112
Github Author: James Ide <ide@jameside.com>
Test Plan:
* ./runJestTests.sh
* test bundle creation with `bundle.sh`
* test `load_dependencies.js` script
* start the server and click around shell app
