mostly just pushing cashmusic.js to latest version

Highlights: 

- inject CSS to the top OR bottom of <head> stack
- inject inline styles or URL to stylesheet as <link>
- completely refactored soundplayer.js
- dynamic creation of soundplayer playlists and player interfaces
- soundplayer bugfixes
- fade-in elements after they're ready (quick, so it's subtle, but gives styles a chance to render)