Many changes:
* Added xresources, containing current colors and settings for urxvt
* Added tmux.conf, with minimal, blue-in-grey theme and vim-like bindings
* Changed jveld.zsh-theme. No more unicode. Displays hostname & 3 levels of
  directory context. Also indicates shell return failures using red brackets.
* Added jveld-minimal.zsh-theme for console use. Same as jveld.zsh-theme, but
  has most colors removed. Still indicates return failure, but uses prompt char
  instead of bracket color
* Annotated and organized vimrc, added some new, convenient keymaps
* Improved pman in zshrc-functions
* Added some linux-specific aliases to zshrc-aliases