Move Encoder and Odometry from robot to xpcc to reuse in seascon 2015.

Now Encoder and Odometry are template based.
Add missing namespaces
Example of using xpcc::motion::Encoder and xpcc::motion::Odometry
Merge branch 'develop' into feature/season2014

Conflicts:
	src/xpcc/motion/encoder_integration.hpp
	src/xpcc/motion/encoder_stm32.hpp