Cytoscape test - DO NOT MERGE

This PR is just to show that Cytoscape still does the weird disappearing thing when loaded separately.

Page for testing:
/rest/widget/gene/WBGene00006763/interactions
-- this is the url to go to a widget directly. It usually just contains the HTML of the widget, but I added the JS so cytoscape would load.


Add js to interactions widget so cytoscape will load when looking at a widget directly (not on a page)

* test for #2957

This tells us that:
* The problem is not conflicts with other widgets or CSS
* The problem *could* be our JS