emacs: fixes for emacs 24.4
emacs: disable powerline
emacs: use helm-mini for listing buffers

helm-buffers-list was unbearably slow with tramp buffers
emacs: disable which-function

Profiling showed that which-function was causing slowdown when jumping
around the buffer.
emacs: delete frame-cmds
zshrc: set TERM to something useful when running under gnome-terminal
emacs: disable helm
emacs: enable ido and ibuffers
emacs: use smex
emacs: bind recentf