The Controllable interface should be split out into a separate file, thus allowing the concrete Controllable implementation to inherit from it about contracts

[mischat]

From @novemberborn

Concept of “controller” is ambiguous in Controllable. Sometimes it’s the Controller contract, other times it’s the address that controls the Controller contract

[mischat]

from @draganm

Did like the fact that the constructor got passed in the Controller not the ControllerResolver ...

[nostdm]

We could move the Controller interface to the controller.sol contract and then import it but that would add extra imports to each file. But then we could extend the interface so that the compiler can enforce it (to be honest I rarely see contracts inheriting interfaces in solidity most of the time interfaces are used to communicate with an external contract)

[nostdm]

Fixed #177