New sample widget - Walkthrough

As recently discussed on the mailing list [1] I have built a new widget for to be considered for inclusion as an demo. I've tidied it up ready for distribution and think it is now ready for testing etc. The name Walkthrough is a quick fix and better suggestions are sought.

The widget was developed by myself as OpenDirective for the University of Oxford. It was commission by the UK IPO http://ipo.gov.uk. The example Data set was created by Rowan Wilson of OSS Watch.

I've attached it as a zip and look forward to comments.

1:http://mail-archives.apache.org/mod_mbox/incubator-wookie-dev/201109.mbox/browser