A big feature in Spina 2.1 was inheritance of the Spina options for

prototypeAttrs and automergeAttrs. The idea was to fix the issue

where, if you don't keep re-introducing the same properties in each

subclass, the options would be lost for their subclasses. We never

released 2.1 because this ended up causing significant unit test

regressions in Review Board.
There were a a few primary reasons it didn't work as expected:


automergeAttrs was processed before prototypeAttrs, which meant

   that any attributes defined as static would override any attributes

   that were merged.


Functions (such as defaults() or events()) could not be

   auto-merged. It would try, but would fail.


Auto-merging could fail to see prototype attributes on the new class,

   instead prioritizing parent classes.


State wouldn't always be copied back to the prototypes after merging.


This change alters the ordering, implements some more careful management

of the state, handles function merging, and carefully accesses the

correct attributes to auto-merge on the new class.

Unit tests pass in Review Board and Spina.