Made AMOptionMenu ARC-aware and fixed some retain loops introduced in the @property definitions.
Made value binding of AMOptionMenuItems optional such tthat the selection state is not necessarily reflected in all items. Added adelegate protocol and property; Modernised ObjC a bit: use autosynthesis, hide ivars in class extension.
Dropped the "is" prefixing of properties
Exposed some more value and options related state in the public interface.
Silenced a logging call.
Merge pull request #2 from mz2/master

Migrated code to ARC and fixed some retain loops