lein/profiles.clj: Add useful leiningen plugins.

Signed-off-by: Wayne Warren <waynr@sdf.org>
kessel: Update window manager & related tools.

* New modm+p keymapping uses Xmonad.Prompt.Shell
* Update xmobar configuration:
  * More interesting system info commands.
  * Change default font.
  * Change default color.
  * Show xmobar stuff on all desktops.
* Set smaller trayer width.

Signed-off-by: Wayne Warren <waynr@sdf.org>