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>

wrap encoding/decodding in an interface to allow for alternative codecs.

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