Basic type support for the new range types in postgres 9.2
add support for range operators listed in http://www.postgresql.org/docs/9.2/interactive/functions-range.html
Implement EXCLUDE constraints for postgres.
Documentation for the new range type support.
Merge pull request #5 from cjw296/pg-ranges

Support for Postgres range types.
this locale is not needed.   maybe it is somewhere but the locale I have ("C", whatever that means,
cannot find meaning of this anywhere in Postgresql documentation) seems to work
- 0.8 changelog
- some whitespace
0.9 changelog
versionadds
Provided a new attribute for :class:`.TypeDecorator`
called :attr:`.TypeDecorator.coerce_to_is_types`,
to make it easier to control how comparisons using
``==`` or ``!=`` to ``None`` and boolean types goes
about producing an ``IS`` expression, or a plain
equality expression with a bound parameter.
[ticket:2744]