Typeahead Wait issues multiple requests instead of just the last one

[socket70]

The new typeahead-wait-ms attribute does delay the drop down from opening until the user stops typing for the given number of milliseconds.

However, once they stop typing, one request is sent for each letter they typed. The expected behavior would be to ignore all but the last key press and then submit one request for then entire value.

Demonstration of the problem:

http://plnkr.co/edit/v8NRtkKnUYjsuMYJInM2?p=preview