De-dupe history entries
De-dupe history entries

History entries may differ only by insignificant trailing or leading
whitespace (especially because we end up creating a history entry with
a trailing space every time we accept and use a selection from the
history finder) so strip it off and `#uniq`.

mtimkovich/command-t,wincent/command-t,yrro/command-t,wincent/command-t,wincent/command-t,mtimkovich/command-t,yrro/command-t