Version 1.2.6

This release:

• Corrects an error where the accel and gyro were being left in low power mode, which was preventing the DMP from operating correctly
  • See DMP.md for more details
  • The critical commit is this one
• Changes _printDebug from boolean to bool - thank you @lwestfall #62
• Removes the references to Accuracy in the Quat6 examples (only Quat9 provides accuracy data)