Video metadata & Publish velocities#125

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AndreasAZiegler wants to merge 3 commits intoAutonomyLab:indigo-develfrom

AndreasAZiegler:video-metadata

Commits on Jul 25, 2017

Added meta data struct. Added method to get meta data. Added calculation of x, y and z velocities and publish them as geometry_msgs/Vector3.
AndreasAZiegler
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Adapted Q to float conversion.
AndreasAZiegler
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Reverted some changes.
AndreasAZiegler
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