Minor HTML5 tweaks

Kept this changes minor for now...

**Modified the meta charset**
- Moved the meta charset tag up to help avoid [XSS vulnerabilities](https://code.google.com/p/doctype-mirror/wiki/ArticleUtf7).

**Removed meta viewport "maximum=1" attribute**
- Adds pinch-zoom [accessibility](http://a11yproject.com/posts/never-use-maximum-scale/) for users who require a larger font size on mobile devices.

**Fixed Atom link**
- Changed type attribute to "application/atom+xml"; title to "Atom".

**Removed xmlns from html attribute**
- Not required in HTML5.

**Swapped div#footer for footer element**
- Better semantics in HTML5 (and does not impact CSS).