jsdoc service classes
Bug 407000 - don't change LHS nav root when clicking on files
Bug 407000 - clicking folder name should Go Into, not expand in place
Improvements to hamburger
Tweaking side navigator re-size behaviour
Sidebar nav: reduce number of event listeners, cleanup code (well i think it's a cleanup)
-allow explorers to provide custom NavHandler
Bug 407000 - clicking editor page's breadcrumb should re-root sidebar nav
Boring jsdoc fixes in commandRegistry.js and related files