Hebrew support

[shlomoweb1]

I love your plugin, I run into problem in the Hebrew language, while trying to add the latter "ת" it keyCode is 188 while ascii does reconize it as a comma,

my short fix in the js file ng-tags-input.js in the event input-keydown I've added a small check if(event.keyCode === KEYS.comma && event.key != ',') shouldAdd = false;