Custom overcommit hooks

[iamnewton]

http://www.guoxiang.me/posts/28-how-to-write-a-custom-overcommit-precommit-git-hook-in-4-steps

Hooks:

• set up overcommit hook with html-proofer (https://github.com/gjtorikian/html-proofer)
• set up overcommit hook that prevents checkin when text content doesn't have character encoded dashes and smart quotes