JSON.decode incompatibility fix for mootools 1.5

In MooTools 1.5 (without compat) JSON.decode now defaults to secure mode which has issues with JSON strings with single quotes and possibly other cases.

This explicits the non-secure decode.
Merge pull request #18 from mtorromeo/master

JSON.decode incompatibility fix for mootools 1.5
Update Element.Data.js

Check against strict and default to true (MooTools 1.5 new default)
Update Element.Data.md

strict for getJSONData defaults to true
Adding listeners for destroyDom/ammendDom events on Behavior itself.

Not sure how I missed this before.