add sbt deps
upgrade spire and spirebot versions
Beginnings of actor support.

This still needs a lot of work. Spirebot.scala still exists as the
old implementation but the new Actors.scala contains what will be
the future.

This branch will probably go away and/or be rebased, so do not fork
it.
working actor impl
org.spirebot -> spirebot
Clean up imports, and shutdown REPL when inactive.
org.spirebot -> spirebot
added timer methods
re-added @time command
update to shapeless-2.0.0-M1