Using OrderingBaseModel via multiple inheritance to standardize models.

commit 0bc3d90a40cdce8bb66e4c610dd6fc538b9df04a
Author: Eloy Zuniga Jr <eloyz.email@gmail.com>
Date:   Mon Feb 25 15:34:03 2013 -0600

    Updating membership and corporate-membership migrations.  These migration scripts update the database to use a column called position.  We are standardizing all models to order by this field via multiple inheritance.

commit 7284eb1ae82e209a30bb82608848b4b8978c1cee
Merge: 2c598f7 75fca0b
Author: Eloy Zuniga Jr <eloyz.email@gmail.com>
Date:   Fri Feb 22 13:33:38 2013 -0600

    Merge branch 'refs/heads/master' into 437_ordering_base_model

    Conflicts:
    	tendenci/addons/corporate_memberships/admin.py
    	tendenci/addons/corporate_memberships/models.py
    	tendenci/addons/corporate_memberships/utils.py
    	tendenci/addons/events/admin.py
    	tendenci/addons/events/utils.py
    	tendenci/addons/memberships/models.py
    	tendenci/addons/photos/forms.py
    	tendenci/apps/forms_builder/forms/models.py

commit 2c598f762b147a2c4c95401e2e4c95cb99cc0aaf
Author: John Eddie Ayson <je@bixly.com>
Date:   Tue Jan 15 05:54:00 2013 +0800

    added data migration for ordering fields

commit 701284a102295c022eba101131a0497a980c877c
Author: John Eddie Ayson <je@bixly.com>
Date:   Fri Jan 11 17:07:17 2013 +0800

    added drag and drop ordering to boxes

commit 6576bd6347c8bc83934498a5875948cd6fdba1e3
Author: Alex <aragsdale@schipul.com>
Date:   Fri Dec 21 14:07:40 2012 -0600

    Add default ordering for stories.

commit dce09eba049a17207ec0c7b1fe29addd9d351e21
Author: John Eddie Ayson <je@bixly.com>
Date:   Fri Dec 14 07:40:49 2012 +0800

    updated ordering for custom reg form

commit 1da1c51db83604101fa32da97854b7a99dcc8149
Author: John Eddie Ayson <je@bixly.com>
Date:   Thu Dec 13 21:57:07 2012 +0800

    added OrderingBaseModel