4.0e  June 22, 2010
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- Added. Ripple filter on the switching supply's output. 
	 Decoupling capacitor near the PIC has been 
  	 increased to 10uF. This has prooven to significantly
	 stabilize the sensor readings while the board is 
 	 powered via an adaptor or battery. 

- Added. A 5.1V Zener diode which acts as a TVS (Transient Voltage
	 supression). This will remove hunge spikes in the power line
	 and make the components (including the PC's USB port) safer 
	 from being fried.

- Added. A 100uF capacitor near the USB port to help reduce power
	 fluctuations when driving motors. Such event is known to
 	 reset the USB connection causing the user to have to re-connect.

- Added. Screw holes for the battery packs. Screwed-in packs are more
	 stable than hot-glued ones. 

- Added. Power solder points for two battery packs. The gogoboard uses
	 two 3xAA battery packs and they previously needed to be wired
	 together. Now there are soldering points for both the packs.
	 This should reduce the cabling mess in previous versions.

- Changed. The ground traces from the motor ports are better separated 
	 from the digital ground.

- Changed. The PCB is better labeled. Run button and user LED are 
	 clearly marked. I2C Bus pins are labeled. Power jumper settings
	 are labeled. 

- Changed. Diode D1 near the power plug has been moved slightly preventing
	 it from accidently being soldered to the plug cuasing a short 
	 curcuit.