There were two significant changes in this commit:

There were two significant changes in this commit:

 * Added implicit primary keys to ActiveMapper.  Now, if you do not speicfy a
   primary key on your objects when declaring them, an Integer primary key
   called `id` will automatically be added to your objects for you.

 * Commented out a large chunk of the process_relationships function that
   should no longer be necessary thanks to some of the deferred mapper
   compilation that was added in SQLAlchemy 0.2.3.  I left it in the code, but
   commented it out just in case this change causes a problem in someone's
   else's code and I can put it back in if needed.