Streaky Text III

Crappy ripoff of FizzyText (seen here, source here, my attempted explanation here).

Improvements:

• Particles pick up the background color from the underlying canvas, which is hidden here
• I like when the particles draw the letterforms without just fillTexting as a crutch
• Refactored improvedNoise.js a bit to return a noise generator, so you can get different seeds or whatever, instead of just a single global noise() function. But that's not really being used yet here...