iot-lab_M3: fix comments from // to /**/
Merge pull request #19 from thomaseichinger/iot-lab_M3-fix_comments

iot-lab_M3: fix comments from // to /**/
Insert -O ihex to generate hex file.
Merge branch 'master' of https://github.com/dangnhat/thirdparty_boards
removing board-conf.h since it is not needed
Merge pull request #20 from vanhieubk/master

iot-lab_M3: Insert -O ihex to generate hex file in makefile.include
Merge pull request #21 from thomaseichinger/iot-lab_M3-board_conf

iot-lab_M3: removing board-conf.h since it is not needed
iot-lab_M3: implement green and orange led
updated to #define-only led implementation
changed to "simple" macros and added parantheses