This project contains Application to test UserButton implementation

This application contains a periodic task.
In each cycle the application toggles the GREEN led.

UserButton functionilty is embedded into the application, so 
that when the UserButton is pressed, it stops the functionality of
application, which stops blinking the GREEN led. 
When the Userbutton is pressed again, the GREEN LED starts blinking again
in each cycle

How to test
-----------

step 1: make clean; make program


Note: Makefile may need to be updated to change /devttyUSB0 or /dev/ttyUSB1
as needed to select the mote on which application needs to be loaded.


