Document against the Ruby or Go client

[pbrisbin]

As far as I can tell, Faktory considers either its Ruby or Go client as "specifications by implementation" for how a Faktory client ought to behave.

It would be nice to put a markdown document in this repository that shows code snippets for each part of the API in Ruby or Go and then the corresponding Haskell that our client supports for the same operation.

We can highlight any gaps or when our ergonomics differ, and seek to normalize to the specification over time whenever it makes sense (or explain when it doesn't).