add keydoc keybinding hinter

See http://awesome.naquadah.org/wiki/Document_keybindings
replace key names with unicode symbols
organize and document keybindings using keydoc
shim dummy keybindings so the auto-generated tag navigation bindings can be documented
tweak layout management bindings
add rule to make GVim windows slaves at 1/3 width factor
add dropdown (quake) terminal