Adding Distance/Angle Clear Service

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Hello,
I use your create controller package and it is fantastic, the one feature that 
I would like to see implemented is a way to clear the distance and angle sums 
without having to send a tank command. Just a simple service that resets the 
distance and angle counts to 0.

I have implemented it myself, but as soon as I update I'm sure that will break. 
Anyway, thanks for all the hard work. This package has made my life much easier!
Liam

Original issue reported on code.google.com by [email protected] on 22 Jul 2011 at 9:46