Specify a font for GTKVim

Specifically, Source Code Pro Medium 9. DIfferent from the settings on OS X as
my main Linux machine has a tiny, moderately high DPI screen.
Merge remote-tracking branch 'origin/master'

* origin/master:
  Homebrwe now puts installed Python scripts into bin
  Add Travis-CI CLI tool support
  Add ~/.cabal/bin to PATH
  Add YAGHK
  Add LESS syntax support
  Add yet another Github SSH key