- 0, 3, mdcarr941@gmail.com, 2ebb8a
Fix bug where writing to a block that already has a Writecap in its header using the creds of
a different node produces an invalid signature (a signature using the creds of the other node).

- 14, 13, mdcarr941@gmail.com, bd6904
Refactor btlib so that most of the types are in their own modules. This is
needed to encourage modularity and weak coupling, as it reduces the amount of code that fields
and helper functions are visible to.

- 11, 3, mdcarr941@gmail.com, bd6904, mdcarr941@gmail.com, bd6904
Create a struct called WritecapBody to contain the fields of Writecap which go into the signature
calculation so that WritecapSigInput is no longer required.

- 5, 1, mdcarr941@gmail.com, bd6904, mdcarr941@gmail.com, bd6904
Move crypto::{encrypt, decrypt} into corresponding {EncrypterExt, DecrypterExt}.