Fiona

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- Replaced .opened attribute with .closed (product of collection() is always
opened). Also a __del__() which will close a Collection, but still not to be
depended upon.
- Added writerecords method.
- Added a record buffer and better counting of records in a collection.
- Manage one iterator per collection/session.
- Added a read-only bounds property.

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- Initial timezone-naive support for date, time, and datetime fields. Don't use
these field types if you can avoid them. RFC 3339 datetimes in a string field
are much better.

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- Diagnose and set the driver property of collection in read mode.
- Fail if collection paths are not to files. Multi-collection workspaces are
a (maybe) TODO.

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- Handle the case of undefined crs for disk collections.

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- Support for collection coordinate reference systems based on Proj4.
- Redirect OGR warnings and errors to the Fiona log.
- Assert that pointers returned from the ograpi functions are not NULL before
using.

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- Support for reading and writing collections of any geometry type.
- Feature and Geometry classes replaced by mappings (dicts).
- Removal of Workspace class.