add a quick map for physicallocations. see #37
take a stab at a more usable interface
add sidebar
only show the sidebar for the entities page. Ghettohack
more work on filtering
clean up sidebar logic, ensure a session value for types is always set
commit helpers
 no longer needed
include these methods in the controller. copypasta.
check request.fullpath vs the ENV
remove reference to @entity_types
don't show item in the sidebar if it's empty