Fix local API_ENDPOINT
Add html5shiv for IE 8 support

Fixes attribution panel (html5 aside tag)
Fix / in slide number
Fix attribution background in IE8
Fix retina images in IE8
Switch to using moment.js for date parsing and formatting instead of custom Storify.utils.displayDate

Date.parse doesn't work with JSON formatted ISO dates in IE 8, so we needed a date formatting library. Rather than writing my own, I used moment.js, which also supports date formatting, so we can remove our custom function for that too.
Fix :hover pseudoclass over iframes in IE < 8
Merge pull request #24 from storify/fix/slideshow-ie8

Fix slideshow template in IE 8