Quaternion <-> Euler angle converting back and forth does not return original value

[DJBen]

Insert the following testing code to testEulerConversion test case and observe it to fail

let quat2 = Quaternion(pitch: 0.12334412, yaw: 1.3521468, roll: -0.53435323)
let (pitch, yaw, roll) = quat2.toPitchYawRoll()
let quat2Ref = Quaternion(pitch: pitch, yaw: yaw, roll: roll)
XCTAssertTrue(quat2 ~= quat2Ref)

[nicklockwood]

Fixed in 0.3.1