Add convenience bridging to Notificator
Merge branch 'master' of https://github.com/iMartinKiss/Objective-Chain

# By Martin Kiss (13) and Juraj Homola (3)
* 'master' of https://github.com/iMartinKiss/Objective-Chain:
  Make convenience Bridge method for single transformer
  Provide Property method to customize its output
  Add debugging Bridge method
  Make Property secretly produce KVO Change objects and use private bridges
  Fix errors with the KVO change class
  Create clss that holds all available info about a KVO change
  Improve OCAProperty mechanism for replacing nils for non-object properties
  UITextField (OCATargetter): producerForEndEditing
  Add more convenience Bridging methods
  UITextField (OCATargetter): producerForText
  Shortcut for removing all consumers from producer
  Fix Key-Path accessor crashng when assigning nil to primitive property
  Add convenience replacement Bridge
  Add Invoker convenience constructor
  Rename Control Target to Targetter and make it universal
  OCAProperty: Workaround for relationship property changes.