Added a few more examples

Hey Tom

Ive added a few more examples including ADC read and servo control.

I also added a file that was needed by one of the examples:
example 12 needed this file stm32l1xx_conf.h in this folder
Libraries/CMSIS/Device/ST/STM32L1xx/include .

Im not sure if i have changed something in the makefile or if it is the new std
peripheral library looking for this file in a new place.
Im not sure but if you figure it out let me know, otherwise everything should work out of the box