1. Implement persistent channel keys (#208)
2. Persist changes to registered channel modes
3. Backend changes for persisting operator status (partial #198)

README.md: self-signed, not unsigned

refactor irc.Socket

implement fakelag (#189)

partial fix for #217

try to fix travis by pinning a goreleaser release

The sync.atomic documentation says:

"On both ARM and x86-32, it is the caller's responsibility to arrange
for 64-bit alignment of 64-bit words accessed atomically."

See discussion on issue; this might not be a complete fix but it's
definitely better than the current behavior.

fix #214

nickserv: implement GHOST, GROUP, DROP, and INFO

Sequence of events:

1. client.nickTimer.Stop()
2. client.server.accounts.Logout(client)
3. accounts sees that client is no longer logged in, does client.nickTimer.Touch()
4. 30 seconds later, RandomlyRename resurrects the zombie client