hey all -

a few fixes i really wanted to get out the door on this one, as they  
were pretty prominent.  also this release has much improved MS-SQL  
support.

still plenty more things to do, but trying to get the "core" as solid  
as possible to start.

0.2.5
- fixed endless loop bug in select_by(), if the traversal hit
two mappers that referenced each other
- upgraded all unittests to insert './lib/' into sys.path,
working around new setuptools PYTHONPATH-killing behavior
- further fixes with attributes/dependencies/etc....
- improved error handling for when DynamicMetaData is not connected
- MS-SQL support largely working (tested with pymssql)
- ordering of UPDATE and DELETE statements within groups is now
in order of primary key values, for more deterministic ordering
- after_insert/delete/update mapper extensions now called per object,
not per-object-per-table
- further fixes/refactorings to mapper compilation


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