Bump version to 1.3.1. (microsoft#33)

- Reorder class declaration.
- Satisfy lint.
- bug fix.

Python SDK update for BUILD 2017 release. (microsoft#23)

* requirements: add pillow, reorder alphabetically.

* Add start, top parameters for list persons.

* More robust response parser.

* Sample update:

- Support more face attributes.
- Fix image rotation bug.
- Minor enhancement and bug fix.

* Bump version to 1.3.0.

* Minor change in result shown.

* Update list person description.

Support more face attributes in SDK & Sample. (microsoft#11)

* Update docstrings for face.detect by introducing emotion.

* Update sample to support headPose,facialHair,emotion.

* Add missing emotion attribute.

* Update README.md.

* pylint.

* Bump version to 1.2.5.