revise and improve overall meta data
[BUG #6674] introduce 'utility' category
[BUG #7445] add demo links
Added .gitignore
Added legacy folder
Former Inspector contrib became part of the framework
Contrib skeletons available via create-application.py -t contribution
Contribs superseeded by framework features
fixed archive checksum
Merge branch 'master' of https://github.com/qooxdoo/contrib-catalog

Conflicts:
	contributions/CanvasCell/trunk/Manifest.json
	contributions/QxDyGraphs/trunk/Manifest.json
	contributions/QxJqPlot/trunk/Manifest.json