Allow generation of a funktor app inside the top-level of a rails dir

[jagthedrummer]

If you want a quick and easy way to switch to Funktor, you're probably going to need to deploy your entire Rails app to Lambda. (This isn't the optimal way to make use of Lambda/Funktor, but it's probably going to be a stepping stone for people.)

We should rename and/or move some files so that we can keep funktor stuff separate from rails stuff and avoid clobbering files and what not.

Currently when you do funktor init in the top-level of a rails project these are the problem areas:

• the config dir will now be partly rails config and partly funktor config, and config/boot.rb will potentially be clobbered.
• Gemfile ... maybe we just rely on the user saying 'no' to clobbering this one?
• .gitignore - maybe we should add stuff if there's an existing file?