optimizely / ruby-sdk / 1456

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NotificationCenter should accept any Callable (#216)

## Summary

**The NotificationCenter learns to accept any callable object as the
  notification callback.**


It is uncommon in Ruby to require `Method` instances when any Callable
will suffice. Indeed, the idiomatic object for callbacks is a block.

With this change, the notification center can accept any callable, not
only `Method` instances; that is, any object that responds to `call`
(`Method`, lambdas, procs, or any object with a `.call` method)

If the callback parameter is omitted, a block may be provided instead.

## Test plan

## Issues

address item 3 of https://github.com/optimizely/ruby-sdk/issues/213

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