added CSS for inline-block for less than IE 9.
added html5shiv.js for less than IE 9 support for latest HTML5 elements e.g. nav.
added CSSPIE for rounded corner support in IE 7 & 8.
due to IE 7 & 8 not handling media queries, the posts list display is now using max-width instead of min-width.
converted post title media query to max-width so the title appears in desktop format in IE 7 & 8.
converted post content to use max-width instead of min-width to fix formatting for IE 7 & 8.
removed use of box-sizing in header to avoid horizontal scroll bars in IE 7.
social footer falls back to text links when icon fonts aren't supported.
added link to return the user to posts page at the bottom of an individual post.