use kill-whole-line directly
fix regexp-opt usage for emacs <24
use \\_< instead of \\< and do so in a way that won't break XEmacs
Update README because go-mode.el is now upstream
Mention gofmt rewrite in README
replace shell-command-on-region with call-process-region

shell-command-on-region sometimes prints process output in the echo
area. We do not want this.