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fix(prefix): Handle node_modules without package.json (#128)

This fixes running `npx` inside temporary projects (ones that have a
`node_modules` but don't have a `package.json`).

`getPrefix()` has useful cases:

1. Finds a path with a `package.json`, returns it.
2. Finds a path with a `node_modules`, returns it.
3. Finds nothing, returns the original path.

Cases 1 and 2 return a path that's useful to `npx`, but case 3 doesn't.
But, `localBinPath()` confused case 2 and 3 (by stating for a
`package.json`), making `npx` only work with case 1. That's no good.

This makes cases 1 and 2 distinct from case 3 (it just returns `false`
now). And `localBinPath()` no longer has to do any stating to
differentiate between paths and `false`, so it's happy. And now `npx`
can run without a local `package.json`. Yay!

Fixes: https://github.com/zkat/npx/issues/104
Fixes: https://github.com/babel/babel/issues/4066#issuecomment-336705199

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