test the new bushido calibrate activity

[jovial]

At the very least we need to check this works. Bonus points will be awarded for adding additional window dressing.

[jovial]

I think I forgot to shutdown the TurboService when we are done with it in the CalibrateActivity. We likely need a call to TurboService#shutdown (if the service is connected) in the Activity's onPause method (or similar). Otherwise, we leak the ant connection and won't be able to connect again without force stopping the app.

[dougszumski]

• When 40kmph is reached displays 'stop pedalling'
• When speed drops below 40kmph it asks you to speed up again

[dougszumski]

This works well enough. Sometimes you need to retry.