Work in progress...

	* fritzing/minimal-shrimp-blink.fzz: Use clear LEDs.
	* fritzing/minimal-shrimp-pov-battery.fzz: Likewise.
	* fritzing/minimal-shrimp-pov.fzz: Likewise.
	* images/arduino-uno.jpg: Reduce resolution.
	* images/minimal-shrimp-blink.png: Regenerated.
	* images/minimal-shrimp-pov-battery.png: Regenerated.
	* images/minimal-shrimp-pov-circuit.svg: Created.
	* images/minimal-shrimp-pov.png: Regenerated.
	* images/pinout.png: Created.
	* presentations/shrimp-pov-instructor.odp: Some new slides.
	* presentations/shrimp-pov.odp: Use new images, better hints.