Add links to pandas and sqlalchemy
Add cytoolz as a hard dep
Add pandas as a hard dep
skip spark tests when pyspark is not available
Rename test files for py.test usage
Update travis for py.test usage
Update requirements.txt to require pytest
Use pytest decorators for skipping and failing
Skip on spark unavailable
Use pytest xfail
Remove unused imports
Clean up after ourselves when testing sqlite locally
Should not require pytest for use
Skip spark and remove nose
Remove array printing code
SQL databases match nullability to datashape.Option

We now inspect database columns for the `NOT NULL` attribute and use
that to determine if the analagous datashape should have Options or not

We hook this into the datashape-sqlalchemy converters and use
the database reflection built into SQLAlchemy
csv: add to CSV docstring
Proper args for running py.test
doctest typo
Merge pull request #409 from cpcloud/req-cytoolz

Correct dependency documentation