Just moved the changes in DriverActivity in master branch to this branch
so we can continue the work we did there here (to avoid further
contaminating master with non-production-ready code).
EKF: fixed bug with initializing the heading in DevicePose. Was
converting to degrees twice.
EKFTests: fixed bug in testBadINSGoodVINS. Accidentally typed toDegrees
instead of toRadians.