added shifts and stepped rotations (#177) (fix #170)
added shifts and stepped rotations (#177) (fix #170)

* added shifts and stepped rotations

* made shift random, fixed rotation to be pixel exact

* docs and linting

eyaler/tensorpack,haamoon/tensorpack,haamoon/tensorpack,ppwwyyxx/tensorpack,eyaler/tensorpack,haamoon/tensorpack,ppwwyyxx/tensorpack