[HabPanel] I Added support for ANY javascript file

More info here:

Just waiting for merge to be approved.

With this script being loaded, sky is the limit now.
You can create your own Angular services/directives/decorators/etc

See above for an example script.

filename must be externalscripts.js inside your /static/habpanel location, which is my case is conf/html/habpanel (you need to create the habpanel directory)