Review appreciated: Golang Crypto/Cert system

[cathalgarvey@cathalgarvey.me (Cathal Garvey)]

Hi all,
This is intended for use in a larger project but I felt the need to 
abstract and containerise some of the crypto. It uses ECDSA and NaCl as 
provided in the Golang libraries, and I've tried to join them in as 
sensible a way as possible without making too many assumptions.

Would appreciate some review to make sure I'm not screwing anything up:
https://github.com/cathalgarvey/easykeys

Thanks,
Cathal