cleaned up Servo class
cleaned up Servo class

ims-tyler/PyBBIO,leftbrainstrain/PyBBIO,leftbrainstrain/PyBBIO,leftbrainstrain/PyBBIO,graycatlabs/PyBBIO,leftbrainstrain/PyBBIO,graycatlabs/PyBBIO,graycatlabs/PyBBIO,graycatlabs/PyBBIO,graycatlabs/PyBBIO,leftbrainstrain/PyBBIO,ims-tyler/PyBBIO,ims-tyler/PyBBIO,ims-tyler/PyBBIO,ims-tyler/PyBBIO