<head> updates in _includes/head.html

-Removing "chrome=1" from "X-UA-Compatible" meta tag. See https://developers.google.com/chrome/chrome-frame/
-Updated <title> to fix the typos; Also tweaked to better align with the Ember slogan.
Merge pull request #284 from alexdiliberto/gh-pages

<head> updates in _includes/head.html