csv: use unicodecsv module in python 2
add unicodecsv to travis.yml
add unicode test file
py26 version_info is straight tuple, not namedtuple
Merge pull request #357 from mrocklin/unicodecsv

Better csv unicode support with `unicodecsv`
expr: scalar date/datetime coercion
expr: basic unsafe exprify implementation
server: Selection API
py2.6 compatibility, dict comprehension
fix typo in docstring
Cleaner SQL for projections using .with_only_columns
Test datetime serialization