Version 2.0.0

- Python 2.6 to 3.5 ready

- code purgation and review, no more debug informations
- delete --debug argument
- fix BoboTiG#5: add a shortcut to take automatically use the proper MSS class
- MSS: few optimizations into save_img()
- MSSMac: remove rotation from informations returned by enum_display_monitors()
- MSSLinux: fix object has no attribute 'display' into __del__
- MSSLinux: use of XDestroyImage() instead of XFree()
- MSSLinux: optimizations of get_pixels()
- MSSWindows: huge optimization of get_pixels()

- little code review

- add doc/TESTING
- remove Bonus section from README.rst
- tests: remove test-linux binary
- MSSLinux: fix monitor count

- fix code with YAPF tool

- better tests and examples
- MSSLinux: fully functional using Xrandr library
- MSSLinux: code purgation (no more XML files to parse)