new styles and code for right panel toggle
move font-awesome include earlier so it can be used anywhere
smaller sidebar toggle with animation
fix handling of POD error display

Classes on <p> elements are now being stripped, so we can't use them to
select the heading of the error block.
small refactor of pod error css to improve display
Updates CONTRIBUTING.md with coding conventions.
Merge pull request #1374 from haarg/panel-toggle-revision

new styles and code for right panel toggle
try harder to override syntax highlighter fonts
Recommend a simpler interactive rebase workflow.
add right panel toggle to release page
Add content to coding conventions.
fix markup on source page
re-optimize some images
move irc link after license
clean up styles for sidebars

A lot of the rules were to override the nav styles to re-normalize
things.  The nav-list isn't part of bootstrap anymore, so just repurpose
it as our own sidebar class, and remove the nav class from the sidebars
using it.  This simplifies things greatly cleans up link sizes as well
as allowing arbitrary content easier.
remove extraneous markup, unneeded after nav-list cleanup
apply sidebar alignment on page load
clean up breadcrumbs on browse, source, diff pages
update font awesome
improve styles on mirrors page