[web/data] Remove broken jquery-json plugin (closes #3590335)
Conversion of Date() objects is somehow broken (don't know why beyond that it's
due to jquery-json's monkeypatched Date.toJSON() method).
Use the now-standard JSON.stringify() instead. http://caniuse.com/#feat=json
says it's supported by all browsers, and even IE going back to version 8.
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