Removed ActorContext spike.
Fixed missing require in Channel.
Correctly fixed missing require in Channel.
Merge pull request #87 from jdantonio/removed-actor-context-spike

Removed ActorContext spike.
Add 4 convenience methods to obligation

wait - waits and returns self
no_error! - waits and raises on rejection, otherwise returns self
value! - returns value, or raises if rejected
exception - allows to call `raise rejected_ivar`
Add Observable#with_observer returning self
Add documentation