[Merge] lp:~thomas-voss/qtubuntu-sensors/add-compass-sensors into lp:qtubuntu-sensors

[Gerry Boland]

Review: Approve code

+bool calcRotationMatrix(const QVector3D& acceleration, const QVector3D& geomagnetic, QMatrix3x3& result)
The maths checks out

Everything else looks ok. Not tested tho

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https://code.launchpad.net/~thomas-voss/qtubuntu-sensors/add-compass-sensors/+merge/289906
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