.exports: Explicitly use UTF-8 even for `LANG`
.osx: Add ExpandedStateFor* variants for OS X 10.9

Closes #361.
Merge branch 'master' of github.com:mathiasbynens/dotfiles into upstream

* 'master' of github.com:mathiasbynens/dotfiles:
  .osx: Add ExpandedStateFor* variants for OS X 10.9
  .exports: Explicitly use UTF-8 even for `LANG`