app controller does not 'need' search controller
move enzyme to generic tree view.
change 'restful' nature to uri param
link back to tree view from tree pharma
options select for different tree types
remove content for previous tree when new tree type is selected
create view correctly in container. keep track of sub views in controller
add new enzymes to controller content rather than views
iterate over children and use class binding to hide or show div when clicking on folder
move the class binding logic to computed property on the tree controller which listens for changes to the node
close all child branches when closing a parent