Myro simulator turnBy turns wrong direction

[Doug Blank]

There seems to be an issue with the turnBy() function and the simulator. For example, doing turnBy(90) will turn the simulator to the right, while on an actual robot it will turn it to the left. A lot of students used this function to make their robot turn left or right for the remoteControl() function. Just wanted to give you guys a heads-up so that you aren't surprised when you run their code and the robot turns left when you tell it to turn right.

(reported by Omar via email from Jay)

[Doug Blank]

Looked like turnTo(deg_or_rad) may also have been backwards, so I flipped it. Need to check with real robot to see what it does. At least the simulator is consistent.

[Doug Blank]

Fixes #155

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