Summary:In projects where you have multiple apps or a different structure (ios is not the directory containing the xcode project) it would be helpful to have the option to configure the directory containing the xcode project when doing "react-native run-ios"
As my PR does not change and does not affect UI it's hard to show a video ;-) Steps to reproduce are:
1. checkout facebook/react-native
2. run 'react-native run-ios' (it will fail)
3. npm link react-native (with my PR)
4. re-run 'react-native run-ios --ios-project-path Examples/Movies/
Now the simulator should open the Movies example app
Closes https://github.com/facebook/react-native/pull/6134
Differential Revision: D3035188
fb-gh-sync-id: edb924ce3cca4e82161cdce3d25f321b03abc765
fbshipit-source-id: edb924ce3cca4e82161cdce3d25f321b03abc765