added copyB64

-	function for mac to copy a file to base64 to the clipboard

Signed-off-by: Shaun <discospider@me.com>
Merge branch 'master' of github.com:sund/dotfiles

* 'master' of github.com:sund/dotfiles:
  fixed #8: no dropbox alias
  fixed Terminal folder getting coppied in
  only the .cache dir
  ignore .cache/shotwell