Add a better image of Goddard and Rocket

Source: http://en.wikipedia.org/wiki/File:Goddard_and_Rocket.jpg
Add better images from MSFC

Sources:

p20a: http://mix.msfc.nasa.gov/abstracts.php?p=3108
p32: http://mix.msfc.nasa.gov/abstracts.php?p=1971
p38: http://mix.msfc.nasa.gov/abstracts.php?p=1885
Quotify <li> as well