store boolean not function
simplify subscribe/unsubscribe function
move styles for sidebar to application.scss
render sidebar on single post view

The sidebar is hidden per default. On small display mode,
there is an icon to toggle its visibility. Currently,
there is nothing like that for large display mode.
do not show >>/<< on small display view
invoke reverse method on array object
custom embedding provider for Bandcamp URLs
remove unused hashtag processing code
ignore relative links when looking for embeddable URLs
fix syntax error
use strict comparisons
simplify Libertree.UI.scrollable
wrap Libertree.UI in immediate function

mostly indentation changes.
move var declarations to the top
simplify
wrap Libertree.Intro in immediate function

mostly indentation changes.
make most functions private
name river mapping function
remove debug output
merge var declarations