Added microseconds and its standard deviation.
Added microseconds and its standard deviation.

git-svn-id: 59b6b80b3f28683e9a006dffc41d8db225db1926@19 ed0607b5-9f2d-40cd-ad1e-287a16c2e87a

cnobile2012/HCSR04Ultrasonic,cnobile2012/HCSR04Ultrasonic