Few improvements on the codebase

[zhiruiwang]

• Make compatible with outputting bot .tde and .hyper format
• Make compatible with both Python 2 and 3
• Improve the efficiency of column type inference
• Clean up files and logs when files already exist

[bwiley1]

Awesome, thank you so much for the improvements!

[zhiruiwang]

You're welcome. If you can find some time push the new version to the PyPI, that would be so great. Thanks!

[bwiley1]

I will right away!