sensor_msgs: Generate optimal msg lentgth when both "xyz" and "rgb(a)…#77

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tmoinel wants to merge 2 commits intoros:jade-develfrom tmoinel:jade-devel

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Commits on Jul 21, 2015

sensor_msgs: Generate optimal msg lentgth when both "xyz" and "rgb(a)" are given to PointCloud2Modifier.
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Commits on Aug 10, 2015

sensor_msgs: the type of "rgba" field must be uint32 and not float32
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