convert to npm module with 'top-level' require-able helpers

[Fishrock123]

e.g. require('bob/status'), require('bob/verify'), require('bob/stream')...

Would make maintaining the spec-ness of this repo much easier.

[Raynos]

👍 If the end goal is to land this in node core then having all bob related work in a single repo might make it easier to work on.

[Fishrock123]

Past conversations indicated people wanted it as separate modules. I think parts like the fs source/sink and whatnot can be , but some should probably just live here.

[Fishrock123]

done now