Emacs: Various changes:

- Moved Haskell-mode configuration to customize
- Disabled Paredit in non-lisp buffers (or more explicitly: Enabled it
  in Elisp and Clojure buffers)
- Removed some custom items that I don't use anymore (e.g. Jabber-mode
  because I switched to bitlbee with rcirc)
- New packages: hi2 (Haskell indent mode revamped), browse-kill-ring
- Always enable undo-tree-mode and recentf-mode
- Keep all auto-save files in /tmp