Webjars resources are not loaded properly by the admin service with Tomcat 6

[andreassalomonsson]

I think the problem is that webjars requires at least version 3.0 of Java Servlet, Tomcat 6 uses version 2.5.

[laserval]

Not good, but I'm not sure what we should be aiming for. Tomcat 7 is still Java6, so that keeps Hydra supporting Java6 at least. (http://tomcat.apache.org/whichversion.html)

Webjars appear to be using a feature that is missing from Servlet 2.x, so I doubt it's possible to port. If we want to support Tomcat 6 we probably have to use a different solution for the JS resources.