Remove ResourceLoader dependencies on jquery and mediawiki

Bug 69468
Merge pull request #105 from wmde/rem_depts

Remove ResourceLoader dependencies on jquery and mediawiki
Remove trailing comma
Merge pull request #106 from wmde/trailingcomma

Remove trailing comma
Link to GitHub instead of mediawiki.org in extension credits
Merge pull request #108 from wmde/changeurl

Link to GitHub instead of mediawiki.org in extension credits
Update README for 0.6.10 release
Cancel event after it got removed