crockford 0.1.0

Provides Crockford 32-bit encoding for identifiers (e.g. u64 values). There was already another library that did Crockford encoding, but it operated on a slice of bytes or something like that, and it was really annoying to use. This one is pretty much a faithful translation of an existing C# library that does only "the needful."
Documentation 
# crockford

> Rust Crockford encoding for u64

There is another Crockford Base32 library available for Rust; I just thought it was incredibly annoying to use, because it doesn't allow you to just plug in a `u64` and get back an encoded value. Rather than take a dependency on the existing library, this library is a marginally faithful port of a C# library that performs the same job.

Wanted: check digits. Wanted bad enough to add them myself? Maybe not.