* Enhancements
  * Added `JOSE.JWS.peek_signature/1` for inspecting the signature parts of a signed binary.
  * `JOSE.JWS.compact/1` and `JOSE.JWS.expand/1` now work with signed lists.
  * First pass at documenting all of the major `JOSE` modules. `JOSE.JWE` still needs more examples. Closes #7

* Fixes
  * Fix infinite loop on `JOSE.JWE.key_decrypt/3` when no `"enc"` has been specified.
  * Fix various functions on `JOSE.JWE` that would fail due to `JOSE.JWE.from_record/1` on wrong terms.