Python-ev3

Working on ev3-ev3dev-jessie-2015-05-20
Fix the uart sensor name
Fix the led issue
Fix typo in the tests
Add atexit handler to stop motor and turn off leds

Fix mindsensors.com AbsoluteIMU and tests
Fix NoSuchSensorError when attache I2C/NXT sensor

Thanks for sharived new motor code

Thanks for jesper-friis LED fix.

Thanks for [sharived](https://github.com/sharived)'s "Magic Wand" code.
Develop on the new ev3dev 3.16.7-ckt3-ev3dev1 kernel.
Remove the old type_id parameter from lego devices.

Fix an issue that motor path change in current ev3dev image.
Fix an issue that type_id is replaced by name attribute in current ev3dev image.
From this relase, there's no stand alone package at github relase page.
Please install by easy_install tool.