Initial version of kvstore from coursera. Only basic sst integration so far.
Allow to ask Arbiter for the current leader.
Add spec for kv-store.
Add a TODO file.
Allow to describe actions.
Merge branch 'master' into kvstore-example
Document the actions.
Spec for ask.
Implement ask support for single responses.
Move RequestSingleResponse to RequestResponse.
Merge branch 'master' into new-akka

Conflicts:
	src/main/scala/sst/akka/package.scala
Merge branch 'master' into new-akka
Add multiresponse type ask.
Delete AskHandler, since RequestResponseHandler covers all functionality.
Merge branch 'master' into new-akka
better syntax in AskSpec.
Merge branch 'master' into new-akka
Rewrite of ask spec and implementation.
Merge branch 'master' into new-akka
Implement single notification subscription for akka.