0.8.0

• Change euler parameter order for create function, was (pitch, roll, yaw, ...), now (roll, pitch, yaw, ..).
• Make eulers always use the indices for extracting and putting values.
• Make euler indices configurable by modifying euler.index.(pitch,roll,yaw)
• Add euler.create_from_(x,y,z)_rotation. This ignores pitch, roll, yaw indices and is a straight insertion into the x, y z values of the array.
• Fix euler -> matrix33 conversion.
• Add tests to ensure euler, quaternion, and matrix rotations are all equivalent.