ENYO-2441: improve behavior of the findPopup

- add replace button
- if any selected value in Ace, findPopup sets the "find' input to this selected value
- a message is displayed if no match to the searched value
- all buttons are disabled if the "find" input is empty

Tested on Windows 7, FF, IE10, Chrome.

Enyo-DCO-1.1-Signed-off-by: Olga Popova <olga.popova@hp.com>