Update API to use Pandas Accessor Extensions#50

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HHammond wants to merge 7 commits intomasterfrom

use-pandas-accessors

Commits on Aug 31, 2018

Minor API improvements
Henry Hammond
committed
Expand tests and update API
Henry Hammond
committed

Commits on Sep 1, 2018

Fix internal state bug
Henry Hammond
committed
Bump version and update API
Henry Hammond
committed
Fix test to be 2&3 compatible
Henry Hammond
committed
update readme
Henry Hammond
committed
fix docs
Henry Hammond
committed