enhancements - 3.4.0 NuGet release

* datarepeater elements will now call 'enhance' on each item after
adding to the repeat container.
* the main button click method AJAX post response will now recognize a
Web API style response if a JSON object response object does not contain
a 'success' property.  A 'success' property will trigger fallback to
current functionality of expecting a property named 'item'.  A non-JSON
string response will still be treated as replacement html. These changes
are backwards compatible.