enabling ch.hopping
HDLC XBee-compatible defines
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mergint develop into master after rpl integration and scons msp430-gcc toolchain.
Merge branch 'master' of github.com:openwsn-berkeley/openwsn-fw
Merge branch 'develop'

Conflicts:
	firmware/openos/drivers/common/hdlcserial.c
	firmware/openos/drivers/common/openhdlc.h
cleaning after merge
unpacking struct that does not need to be pack
SAMR21 BSP Support Added
Build Failures are Fixed for SAMR21.
SW-42. Added HDLC command 'Z' to include both DAGroot and bridge modes.
FW-275. Dummy std_uart0 project for TelosB.
FW-275. Fix.
Merge pull request #99 from mathivanane/develop

FW-233. Atmel SAM R21 Xplained Pro BSP port.
Merge branch 'develop' into develop_SW-42
preparing for merge
Merge branch 'develop'
Merge pull request #101 from openwsn-berkeley/master

Consolidating develop and master branches
FW-276. Fix.
Merge pull request #103 from openwsn-berkeley/develop_FW-276

FW-276. Fix.
Development of JSON module and addition of DAG rank to COAP payload.

* Added ability for jsonpayload to write uint16_t value, and refactored int
  value writing.
* Added ability to write multiple attributes, including use of a new
  write_state_t enum to track state.
* Added doxygen comments.
* Use new locally defined address, ipAddr_monServer, for the CoAP monitoring
  server, rather than ipAddr_motesEecs in opencoap.h.