IE SCSS include _grid.css

IE8 and below should probably still get the grid styles by default.
Original code was giving me a strange 4-digit day of the month on the single page. I substituted in the correctly working string from index.php
Merge pull request #328 from peterhartree/master

ie.scss - amend to also @import _grid.scss
Merge pull request #334 from pjv/date-on-single-fix

4-digit day of the month on single.php
adding new favicon setup to include windows 8 tile support