Those motors have two coils, each with a center tap, which allows it to be wired for either unipolar or bipolar drivers. To use with a reprap, ignore the brown wires and connect the blue ones to the driver. Pines 1 and 3 from the motor go to pins 1 and 2 of the diver, and pins 4 and 6 go to pins 3 and 4. If it doesn't move, swap the center wires. If it moves in the wrong direction, reverse the connector or adjust the firmware to suit.
