Build a CLI to make it easier for users to initiate a Bundle

[GabrielCTroia]

I believe this would be really useful in hands-off product demo.

Imagine only having to:

Initialize a Bundle:
$ betelgeuse bundle init

Support platforms
$ betelgeuse bundle support ios
$ betelgeuse bundle support web

Compile source
$ betelgeuse compile

Deploy
$ betelgeuse deploy

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This would clearly help down the line, but it in the beginning I think initiating a new app, is the single most important one, so the user doesn't have to add all the necessary files to make it a valid package.