Simplify session storage to single key with toggled controllers array

Replace per-controller session keys (collapsed_sidebar_authors, etc.)
with a single session[:aas_toggled] array tracking controllers that
have been toggled from their default state.

Version 2.0.0

Version 1.2.0

Version 1.1.0

0.0.5

0.0.4

version 0.0.3