Additional info on state changes of buttons#59

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sven-bock wants to merge 3 commits intoRethinkRobotics:masterfrom HumaRobotics:master

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Commits on Aug 12, 2015

Initializing a camera controller does not raise an exception, if the camera is not opened. This is useful to check, if a camera is opened or closed.
sven-bock
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On state change in addition to the state, the itb name, "button" or "wheel" and the button id or wheel position is sent in the arguments.
sven-bock
committed
On state change the name of the button is sent in addtion to its state. Useful for common callbacks
sven-bock
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