Override Ajax requests with custom method

[recallfx]

Override Ajax requests with custom method still using all of transport functionality.

This is different approach to issues #95, #206 and #232, than in pull request #220.

Basically we are replacing $.ajax(url).done(done) with this.override(url, done), this way we still have caching and request threshold.

Usage could be as simple as this:

      $('.override').typeahead({
        remote : {
          url : '%QUERY',
          override : function(query, done){
            setTimeout(function() {
              done(['one', 'two', 'three']);
            }, 500);
          }
        }
      });

Note, that query is encoded, so url must be the same as wildcard;

[jharding]

Appreciate the pull request, but I've actually already implemented something similar in the integration-0.10.0 branch.

[divadrei]

could you explain what you got in mind in branch integration-0.10.0 and/or simply give a commit # ?

[acemtp]

I still need a "source" way to feed the values with a function instead of a static array or a ajax request.
I don't find in the branch integration-0.10.0 where the code is to do that.