enable Seam Cache provider with EhCache

implement of Seam EhCache bundle.
I've not add dependency in nuxeo-core...  but it will greet to append
this bundle

It will enable s:cache component for JSF views and allow to use
Seam Cache provider in Nuxeo listener. We have a new panel for admin
centre for refresh caches.

this bundle must have the Seam namespace in components.xml

https://github.com/pguillerm/nuxeo-distribution/commit/6d467279826405fce6a1a2f8be5e34babadf5158