retina-fy all of the icons
Slide-down header for interpretations of whole sections should just include the section number
Special case for Appendices. Also, don't lowercase everything -- instead, *stop* uppercasing
Only strip newlines off the end of the text. Stripping them off the beginning can mess up offsets
section wrapper for regs meta data
fix merge conflicts
Merge pull request #157 from cmc333333/tweaks

Interpretation Slidedown Header Tweaks + Offset Issue
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
Added in id to appendix header, so that anchors can work
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
using preventDefault keeps content from jumping in Safari/webkit