Removed the sleep from server step.

The sleep from server thread makes no sense as the read is blocking and
anything after the read operation is just wasted time before the next
command can be queued up
Added playground test for the ADXL345 class
Read and Update now actually read the values from the chip
Accelerometer must be represented in double to get the best precision
Added * operator

Also fixed 80 line formatting
ADXL345 now allows changing scale types.

Still todo however is actually test the value when scaling is applied
The sensor now can scale to different types of measurments

For this we also added a + and *= operator to Point
Merge branch 'sensor' into testing