Added support fo STM32L0x chip id and base params.
Add support for STM32L0x.

First try to support new STM32L0x family. Tested
on NUCLEO-L053R8 development board
http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/LN1847/PF260001

Chid ID, read, erase and write flash works fine.
Merge pull request #253 from Netolish/master

First support for STM32L0x family