Better handling of deactivation/reactivation of links and events

Concerning issue #12, there was a bug when parsing element attributes, now corrected. All a.href, all on* attributes and all ajaxify attributes are deactivated.

However there are plenty of other ways to trigger a page change when clicking on an element. 
For example in https://www.facebook.com/MadHatterCafeWeymouth, clicking on the address does not lead anywhere (OK), but clicking on the parent div (no text) leads me to another page. Didn't find why.