Tweak the parameters a bit

Allow more snakes to appear on the screen and make snakes get added more slowly.
Merge pull request #9 from dsshimel/patch-6

Tweak the parameters a bit
adding setup for real display
fixing naming and test list
New pattern: DNA

Draws a different, color changing, pulsating DNA double helix on each of the eight panels. Disorient colors are in the middle.
Don't change the background so often
Merge pull request #10 from dsshimel/patch-7

New pattern: DNA
Merge pull request #11 from dsshimel/patch-8

Don't change the background so often
Merged with conflicts dealt with.