Added the ability to use the web jars CDN.
Separated the creation of the resource reference into two methods, one
for JS and one for CSS.
Removed the test scope from the wicket-request dependency for the
library.
Added a request mapper to route webjar references to the webjar CDN.
Added configuration to WicketWebjars for using the webjar CDN if it is
specified in the settings.
Changed the webjars reference in the HomePage.html to be relative to the
context root.
Changed the ResourceReferenceMapper to use the same caching strategy as
the Wicket application.
Changed the WebjarsCDNRequestMapper to strip off the Wicket resource
version number before transforming it to the WebJars' CDN URL.
Modified the WebjarsCDNRequestMapper to remove the resource version
using the undecorate method from the application's cache info -- based
on how similar functionality is implemented in ResourceMapper.
Merge pull request #13 from ageery/master

Added the ability to use the web jars CDN.