First commit

First commit of stm32 code, includes read/operations and pwm output
AnalogRead Example - added conf file

I added the new example to do analog readings but I also
added the file stm32l1xx_conf.h to the
Libraries/CMSIS/Device/ST/STM32L1xx/include folder. Im not sure if i
have changed something or it is the new std Lib looking for this file
on a different location