retina-fy all of the icons
section wrapper for regs meta data
fix merge conflicts
fixed meta data and improve sidebar view on smaller screens
vertically center text in subhead
retinafy the plus/minus sprite
improve icon alignment in sub-header
improve positioning of close button in TOC
added one more em of padding below definitions/sidebar per @yuda's request
add class to html tag based on IE version
add favicon
prevent main head from breaking on small screens
fix merge conflict
Merge pull request #158 from ascott1/master

Layout, Icons, and bug fixes