Optimized timestamp retrieval to take advantage of faster Date.now() available in all modern browsers, with backwards compatable option for IE < 9
Merge pull request #2168 from cflynn07/master

Optimize timestamp retrieval for modern browsers with backwards compatibility
Merge pull request #2169 from teynon/master

Deleting files misleading - Files removed before ajax request is processed
Updated version numbers.
Use a cross-frame compatible instanceof check - Closes #2172.

Also see
http://perfectionkills.com/instanceof-considered-harmful-or-how-to-write
-a-robust-isarray/
Ignore events not triggered by the widget listeners. Fixes #2177.
Removed unecessary argument. Closes #2178.
Accept empty responses (no JSON) for DELETE requests.
bluimp 5.28.8 merge