Merge pull request #749 from blueyed/setopt-correct

Only `setopt correct`, not "correct_all".

lib/correction.zsh

-setopt correct_all
-
-alias man='nocorrect man'
-alias mv='nocorrect mv'
-alias mysql='nocorrect mysql'
-alias mkdir='nocorrect mkdir'
-alias gist='nocorrect gist'
-alias heroku='nocorrect heroku'
-alias ebuild='nocorrect ebuild'
-alias hpodder='nocorrect hpodder'
+# correct commands, but not any arguments (correct_all would do that)
+setopt correct