Initial version of custom Amd HeaderItem
Clean up and javadocs
Introduce RequireJsPanel (second version of RequireJsTag) that provides the config and require.js
Add support for Wicket bundles
Use Wicket's default ResourceBundles to find whether a HeaderItem is in a bundle
Use a copy of FilteringHeaderResponse from Wicket 6.8.0-SNAPSHOT until 6.8.0 is released.

This saves us writing custom IHeaderResponseFilter for non-filtered HeaderItems
Move required configuration to RequireJs#install()
Simple variable rename
Merge pull request #3 from martin-g/amd-header-response

Automatically generate RequireJS config for all AMD modules in an application