Update mouse acceleration for trackball
Fix font rendering (again)
Change back to urxvt

The key to getting text to render correctly in urxvt is: URxvt.letterSpace: -1
Source Code Pro in particular was awful without this, everything was
tracked out by a couple pixels without this fix. (That's why I switched
to xterm, I couldn't figure out how to fix it years ago.) urxvt is my
preferred emulator, and with that issue fixed I can go back again! =)
Fix keys for urxvt+zsh
Add utility to quickly reload xrdb config
Add launching chrome for clicked links in urxvt