Reset frame imu

[Ryan-Red]

See Tracking.cc line 1788

[Soldann]

Moved to line 1692 in the most recent commit:

MORB_SLAM/src/Tracking.cc

Lines 1692 to 1694 in 7ff9c43

	void Tracking::ResetFrameIMU() {
	// TODO To implement...
	}

Seems like vestigial code from the development phase and can probably be deleted in a later phase