Update libraries

* Updated jQuery to v1.11.1
* Updated Modernizr to v2.8.3
* Moved JS libraries to `js/lib`
* Removed `dd_belatedpng.js` since we don't support IE6
* Set viewport for responsiveness
* Added `$myPageID` variable
* Added change log to README
Merge pull request #12 from sntran/master

Update libraries