Re: [deviceorientation] Opposite z-axis for example 7 (#96)

We could also add a clarification: _unlike the name suggests, it represents the sum of all accelerations, except the gravity_.

Examples: 

7. {x=0, y=0, z=+9.81} when lying flat on a horizontal surface (acceleration from the underlying surface)
8. {x=0, y=0, z=0} in case of free fall (the only acceleration is gravity)

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