Add molokai color scheme
Fix bad $TERM color setting for tmux

Evidently tmux is touchy with term settings. This should really be
reported in the settings of the terminal, but changing it in iterm2
doesn't seem to have any effect.
Activate molokai color scheme
More effectivly use Unite

was using BufExplorer before, but there's plenty of overlap with Unite's
buffer mode.
Clobber unused bufexplorer plugin