Merge remote-tracking branch 'upstream/master'
Fixed tests for Chrome

"validating multiple checkboxes with 'required'" test.js was using
$.fn.attr() when it should use $.fn.prop() instead.
Another reboot experiment.

Trying to rebase project to original master.
GitHub has some issue with Head

GitHub.com is not comparing to latest master when doing Pull Request, so
I'm manually reverting these files so that GitHub only includes my real
challenges.
More reboot changes for GitHub
Even more reboot changes for GitHub
Fixed error in test case

"validating multiple checkboxes with 'required'". attr() set is now
deprecated in jQuery 1.9.0. Changed it to prop instead.
Enforced types in rules module

Changed tests and Validate to adapt to prop() which uses real types.
I.e. a number cannot be saved as a string, just like with prop().
Removed jQuery 1.4.4 & 1.5.2 because they're no longer supported.
GitHub has some issue with Head

GitHub.com is not comparing to latest master when doing Pull Request, so
I'm manually reverting these files so that GitHub only includes my real
challenges.
Merge of rebase and minor fixes
Added missing file from origin master
Fix for tests in Chrome with jQuery 1.9

Proper usage of prop() instead of attr() in test.js
Merge branch 'jQuery-1.9-update' of https://github.com/seriema/jquery-validation-for-jq1.9 into jQuery-1.9-update

Conflicts:
	jquery.validate.js