* Adding dataframe object and minor APIs
* Adding reduce functionality
* Adding some print and making reduce work on current Ray
* Cleanup
* Added new functionality and docs.
* Adding more functionality.
* New functionality with older cleanup
* Complying with flake8 formatting
* Added tests and addressed reviewer comments
* Complying with flake8.
* Adding pandas to travis and requirements doc
* Fixing flake8 failures
* Fixing flake8 errors from imports
* Fixing import error
* Fixing import errors
* Addressing reviewer comments
* Addressing lint error
