Reworks how the simulator is handled to ensure that we are using a single targeted simulator platform (e.g.: iOS 9 on iPhone 5s), and that the Simulator is in good shape to handle that.
Since Code runs in Node, rather than Chrome, we need to require the `sync-request` module. The global `__debug__` object was exposed by the vscode-react-native plugin v0.1.5 for us to be able to do that.
Resolves#374