Merge pull request #48 from github/menu-clickarea-fix

Make sidemodule links take up 100% of the width
Style for header links
Add anchor elements to all headers
Merge pull request #49 from github/header-links

Header links
Merge branch 'header-links'
Make first library link in each header clickable

Fixes the header element overlaying the first list element, as
mentioned in https://twitter.com/ctshryock/status/403171957236977664
Such noob. Very mistake.

The font is stored as octiconsregular, not octicons
Merge pull request #51 from github/header-link-font-fix

Fix missing link character
Merge pull request #50 from github/library-header-fix

Make first library link in each section clickable
Merge remote-tracking branch 'internal/master'
Blue hover state
Don't restyle the ToC every time you click in a toggle list
Retina arrows
No hover background color for arrows
Merge pull request #52 from github/menu-arrows-fix

Fix broken ToC menu arrows. :sparkles:
More :sparkles:
Make sure section header is always clickable
Larger click area and active border for sub sections
Left border for active sub section in ToC
Slightly lighter borders on start page