Coaster

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* ``load_models`` now caches data to ``flask.g``
* SQLAlchemy models now use ``declared_attr`` for all columns to work around a
column duplication bug with joined table inheritance in SQLAlchemy < 0.8
* Misc fixes

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* ``get_next_url`` now takes a default parameter. Pass ``default=None`` to
return ``None`` if no suitable next URL can be found
* ``get_next_url`` no longer looks in the session by default. Pass
``session=True`` to look in the session. This was added since popping
``next`` from session modifies the session, which shouldn't happen in a
``get`` function
* ``load_models`` accepts ``g.<name>`` notation for parameters to indicate
that the parameter should be available as ``g.<name>``. The view function
will get called with just ``<name>`` as usual
* If the view requires permissions, ``load_models`` caches available
* permissions as ``g.permissions``

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* ``coaster.views.get_next_url`` now looks in the session for the next URL

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* New ``coaster.app.init_app`` function moves away from passing configuration
status in environment variables

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* SQLAlchemy models now have a ``permissions`` method that ``load_models``
looks up

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* Added logging module