Implmented an actor wrapper that keeps track of if the actor has been terminated.
This is used since not all 'users' of the isTerminated methods are actors, hence
they cannot use the 'context.watch' method themselves.
Import cleanup
Added copyright information.
Updated variable names to better reflect the code.
Updated code after feedback.
Merge pull request #104 from typesafehub/wip/h3nk3-remove-warnings

Wip/h3nk3 remove warnings