Added DBPEdia query interface
added download function the the RDFResult class
Merge branch 'master' of git://github.com/kkoch986/pattern into origin
OAuth bug fix, use urllib.quote() instead of quote_plus()
canvas.js small updates
update pattern.web examples
update pattern.web API license keys
update contributors
DBPedia + DOM CSS selectors + updated Twitter API

- DBPedia API (thanks Kenneth Koch!), see examples/01-web/08-dbpedia.py
- DOM CSS selectors, see examples/01-web/12-dom.py and source code
- Twitter API v1 is deprecated and doesn't work anymore.
- Twitter API upgraded to v1.1, see source code