More font/colorscheme fiddling

Made the default font for both urxvt and gvim Inconsolata-dz. This has
straight " and ' characters, opposed to the default Inconsolata with
slightly angled ticks. Added a couple of other good-looking fonts to my
~/.fonts/ directory.

Changed the vim colorscheme zenburn high-contrast, and configured urxvt
X resources to match. The zsh prompt looks a little better with the "#"
prompt character, I think. To make root privileges obvious, print out
the word in that case.