CAN Connector handles bus off error

Drop messages when the CAN controller is in the bus off state to avoid an overflow of the waiting messages lists.
Added encoder mode for STM32 general purpose timer
Adapted CAN connector to the new CAN interface
Merge branch 'develop' of github.com:roboterclubaachen/xpcc into develop
Lpc: Clock: pllM means multiply by 1 thus we need to subtract 1 from pllM value
Lpc: Xml: add more pins
Lpc: make can driver compile
Lpc: Examples: make blink compile again
Lpc: Gpio: add features present in stm32 driver

TODO: configure for HW still missing
Lpc: Uart: make work

Tested in Hardware with Uart example (see next commit)
Lpc: Examples: Uart: working with st-link v2
Merge branch 'develop' into feature/season2014