v1.1.0: Cross Attribute Type Constraints

• Deprecate a few methods to encourage best Auto Layout practices, and clear up some confusion (please migrate to the suggested replacements, as these methods will be removed from the API entirely in a future release!)
• Introduce a brand new set of generic API methods that allow any ALAttribute to be constrained to any other ALAttribute of another view (e.g. one view's horizontal axis to another view's top edge)
• Minor internal cleanup and enhancements