Remove traces of unicodecsv
fix sql distinct
scalar_coerce('?int', 0) is 0, not None
Merge pull request #649 from cpcloud/doc-fixes

Remove traces of unicodecsv
Merge pull request #650 from mrocklin/sql-distinct

More sql fixes
Add test for mixed string dataset
Test that Python 3 doesn't let float nans be coerced to ints
No need to convert_objects
Separate chunking and not chunking
Make sure we close files properly
Try tempfile again
Use our own open function
Shorten test a bit
Arg tempfile
Do or do not there is no try
Use our own opener
Move the functionality out
Refactor test_csv
Try plain returning
Give up