Make a single click toggle folder navigation

Removes `currentTarget` from selecting folders which is a little odd as it currently focuses the folder menu item which should not be selectable (opinionated)
Merge pull request #238 from mulesoft/single-click-folder

Make a single click toggle folder navigation
Add support for importing from Swagger URLs
Connect to self-signed HTTPS sites
Update swagger to raml object conversion
Rebuild dist
Add local file import support
Support importing as a zip file