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
updated for qx 3 and 3.5
verified 3.5 compatibility
added qx 3.5 compatibility
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
fixed conflict
Merge pull request #2 from oetiker/master

contrib updates for qx 3.5
initial QxD3 integration
fix spelling
Merge pull request #3 from oetiker/master

new contrib for integrating D3.js
add checksum to enable archive download
sync with latest update