Rework ~/.bin to use symlinks instead of manipulating /Users/Josh/.rbenv/shims:/Users/Josh/.rbenv/bin:/usr/local/share/npm/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin:/Users/Josh/.bin:/Users/Josh/.bin/fasd:/Users/Josh/.bin/formd:/Users/Josh/.bin/git-cr