Visualize101.ino: Simplify sensor reading

[eriknyquist]

CurieIMU now has dataReady() functions to check for newly available
accel/gyro data, and also readAccelerometer/GyroScaled(), which reads
then sensor and returns values scaled according to the configured range.
Using these functions in the Visualize101 example makes the source much
simpler

[eriknyquist]

arduino/ArduinoCore-arc32#317 has been merged, this can also be merged now.

[PaulStoffregen]

Has this new 101 core been released to the boards manager downloads?

If it's only been merged on github, but not yet officially released via the boards manger, then updating this library could break things for 101 users.

With this in mind, just tell me when you want it merged. They're your users....

[eriknyquist]

Good point @PaulStoffregen-- I was not thinking straight on Friday. So don't merge yet- I'll let you know when our next release is available from the IDE library manager (currently it is not).

[eriknyquist]

Updated to use readAccelerometerScaled, and readGyroScaled, which greatly simplifies the example (manual conversion no longer required).

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