Make autocomplete dependency optional

[djmj]

In case autocomplete feature is not used the dependency on jquery UI autocomplete is not required. A boolean flag autocompleteEnabled would be nice.

Alternate

It can be made optional by checking if the autocomplete function is available. I prefer a boolean flag.

http://stackoverflow.com/questions/85815/how-to-tell-if-a-javascript-function-is-defined#85973

Changes following check to lines:

if(typeof(that.tagInput.autocomplete) === typeof(Function))

• 270: on enter key
• 285: if condition where autocomplete is created