Remove base64 from the saved notes

Base64 isn't really getting us anything, and it's only adding unnecessary code
and using up more disk space (almost 40% more) than just writing the binary
directly. Removing this will break previously running installs with notes that
have not yet been decrypted.
some image updates. show final ciphertext is saved as base64
Merge branch 'master' of github.com:atoponce/d-note