FW-177. Add cross-platform builds for simulation library.

* Supports x86-linux, amd64-windows, and x86-windows target build from an
  amd64-linux host, using MinGW-w64.
* Added two SCons build variables:
  * simhost   - simulation host architecture/OS to build
  * simhostpy - location of simulation host Python headers and library
* Added Scons tool module for MinGW-w64 support, and added SCons utils
  module.
* Reformatted SCons help text and provided more informative descriptions.
added iot-lab_M3 bsp drivers
added iot-lab_M3 projects folder with .gitignore file
added 01bsp_leds project
added 01bsp_bsp_timer project
added 01bsp_radiotimer project
added 01bsp_uart project
added 02drv_opentimers project
added 01bsp_radio_tx project
added 03oos_openwsn project
last 2 bytes are crc and rssi and they are read after
Merge pull request #34 from kb2ma/FW-177i

FW-177. Add cross-platform builds for simulation library.
Merge pull request #35 from AlaeddineWeslati/develop_FW-178

FW-178. Experimental fix.
FW-181. Fixing iar-proj projects for the GINA platform.
FW-181. Fixing iar-proj projects for Z1 platform.
FW-181. Fixing IAR projects for the wsn430v13b platform.
FW-181. Fixing IAR projects for the wsn430v14 platform.
Merge pull request #36 from openwsn-berkeley/develop_FW-181

Fixing FW-181.
Merge branch 'develop' of https://github.com/openwsn-berkeley/openwsn-fw into develop