Signed-off-by: Silas Davis <silas@monax.io>

Signed-off-by: Sean Young <sean.young@monax.io>

The keys client and and server is now built into burrow, see the
"burrow keys" command.

Signed-off-by: Sean Young <sean.young@monax.io>

Move various crypto bits to the top-level, so that we can reuse
it for the key, which will be added in a later commit.

Signed-off-by: Sean Young <sean.young@monax.io>

Signed-off-by: Silas Davis <silas@monax.io>

event-waiting code in client and other miscellaneous fixes.

Signed-off-by: Silas Davis <silas@monax.io>

encapsulate go-crypto within our account abstraction layer, remove
various panics, prefer stdlib ed25519 methods over go-crypto.

Signed-off-by: Silas Davis <silas@monax.io>

Signed-off-by: Silas Davis <silas@monax.io>

licence: remove various GPLv3 copyright headers;

event_new: remove unused package that had been copied for discussion

monax: lingering eris -> monax company rename

licence: last pass, further cleanup

client, keys: debugging unit tests on the lack of proper types (before introducing types post 0.12.0-rc3)