Arduino timer implementation without external library
Merge remote-tracking branch 'upstream/master' into timer_ISR
added prescaler value which depends on F_CPU
changed node id assignment and added debug messages
some fixes
using TIMER1 and merging arduino task implementation from inse-arduino branch
Merge branch 'timer_ISR'

Conflicts:
	wiselib.testing/external_interface/arduino/arduino_application.h
	wiselib.testing/external_interface/arduino/arduino_timer.h
minor changes to timer example
Merge remote-tracking branch 'upstream/master'
fixes to xbee interface
Merge branch 'xbee_module'

Conflicts:
	apps/arduino_apps/xbee_radio_app/Makefile
	apps/arduino_apps/xbee_radio_app/example_app.cpp
	apps/arduino_apps/xbee_radio_receive_app/Makefile
	apps/arduino_apps/xbee_radio_receive_app/example_app.cpp
	wiselib.testing/external_interface/arduino/arduino_xbee_radio.h

merging xbee branch
bluetooth module updated
Merge branch 'xbees2_module'

Conflicts:
	wiselib.testing/external_interface/arduino/arduino_xbee_radio.h

xbee conflict resolved
Minor fixes and final cleaning
Merge branch 'master' into parita-master

Conflicts:
	wiselib.testing/external_interface/arduino/arduino_application.h
	wiselib.testing/external_interface/arduino/arduino_bluetooth_radio.h
	wiselib.testing/external_interface/arduino/arduino_task.h
	wiselib.testing/external_interface/arduino/arduino_timer.h
	wiselib.testing/external_interface/arduino/arduino_xbee_radio.h
Merge branch 'parita-master'