FW-170. Include shell option for OS call to upload firmware to telosb

Fixes upload failure on Linux.
Merge pull request #28 from kb2ma/FW-170

FW-170. Include shell option for OS call to upload firmware to telosb
adjusting pins to openmote cc2538
modifying debugpins cc2538
debugpins using adc pins in xbee pinout
SW-172. Fix.
different PORT_delayTx value under debug mode or not. In debug mode, the node would not go to sleep forever (OpenMoteSTM's UART can receive the "toggle" command in Openvisualizer in debug mode).
Merge branch 'develop' of https://github.com/openwsn-berkeley/openwsn-fw into develop
Changes to topology.c
FW-176. Fix from Cédric Adjih.
Merge pull request #29 from openwsn-berkeley/develop_FW-176

FW-176. Fix from Cédric Adjih.
SW-176. Fixing typo in comment.
add different timing for run , sleep and stop modes
FW-173. Fixed ieee802.15.4e timing for stm32. Fixed Uart Rx (toggle button available for stm32)
Updated the eui64_get for the CC2538 chip based on the memory mapping information provided by Texas Instruments.
Fixed a bug in the eui64_get function that prevented from reading the MSB.
Merge pull request #30 from peretuset/develop

EUI-64 on CC2538
Merge pull request #31 from openwsn-berkeley/develop_FW-173

Develop fw 173
cc2538 bsp modifications
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.