Summary:
Currently we just try to resolve a rn-cli.config.js file by walking up the tree from node_modules/react-native. In non-standard uses of RN, when your copy of RN may not live within node_modules, it's impossible to use rn-cli.config.js. This PR adds a "config" flag to the cli that let's you pass in a path to rn-cli.config.js.
cc ide
Closes https://github.com/facebook/react-native/pull/7883
Differential Revision: D3382823
Pulled By: bestander
fbshipit-source-id: b946f3bb355050fc2fe99273d0e99e441dbed111