Fix requirements, and only add download script on PY2
Update docs to reflect float32
Check directory matches when caching dataset
Add a 'default dataset location'
Merge pull request #51 from danielrichman/setup

Fix requirements, and only add download script on PY2
Merge pull request #52 from danielrichman/docs-fix

Update docs to reflect float32
Merge pull request #53 from danielrichman/cache-directory

Check directory matches when caching dataset
Merge pull request #54 from danielrichman/default-location

Add a 'default dataset location'