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.
Several fixes to the CC2538 bsp. Summarizing:
a) Added code to initialize and select the internal and external antennas via GPIOs
b) Added code to initilize the clocks appropriately (System = 32 MHz, Peripherals = 16 MHz)
c) Added code to initialize the appropriate sleep mode, right now it only goes to PM0 (WFI)
d) Added code to initialize the GPIOs for low power consumptions
e) Added code to initialize the peripherals according to the sleep mode
f) Fixed a bug in the radio that caused to read two more bytes from the receive FIFO
g) Removed a comment from the startup code to ensure that it works with the J-Link
h) Fixed the UART driver to ensure that it is configured appropriately and remove a bug related to the interrupts.
All the fixes have been tested and seem to be working fine.
Revert "Several fixes to the CC2538 bsp."

This reverts commit 82669091ff457607ca1b1612e608e86347b933af.