update Unimpaired
yanked from Steve Losh
tweaks
don't use "tags" for CtrlP root marker

I thought it was a good idea because ruby gems will have a
ctags-generated file in their root, but there are sometimes other things
in the project named "tags" that screws up CtrlP, like "app/views/tags".
make TmuxWinCmd function private to script
more compact status line