Add images.sh script to compare old and new images
Add better Skylab images

Sources:

p385a: http://images.ksc.nasa.gov/photos/1973/captions/KSC-73P-0646.html
p385b: http://mix.msfc.nasa.gov/abstracts.php?p=1382
Re-add even better images (higher resolution)

Let's call it future proofing, or pixel paranoia.

Sources:

p6a: http://www.hq.nasa.gov/alsj/a11/ap11-69-H-365HR.jpg
p6b: http://images.ksc.nasa.gov/photos/1969/captions/KSC-69C-1940.html
p6e: http://www.hq.nasa.gov/alsj/a11/ap11-S69-39961HR.jpg
p64a: http://grin.hq.nasa.gov/IMAGES/LARGE/GPN-2000-001274.jpg

p6e is actually not the same image as in the book, but now it's
wrong *and* high resolution.