Create a CLI module

[DanielZlotin]

Will make working with the project a breeze. Instead of defining stuff in the package.json, pass arguments to the cli, for example: detox build ios/MyApp.xcproj MyAppDev, detox run e2e/,
then the cli automatically figures out what and where to build.
Then, in the user's package.json, he can define those scripts once like so "e2e": "detox build ios/MyApp.xcproj MyAppDev && detox run e2e/", and forgo all other installation and configuration coupling to the build path

[LeoNatan]

As per #55, we should have an argument to close or not close the simulator.

[rotemmiz]

detox-cli is a part of detox 5 release.