gulp-mocha: Gulp-Mocha fails to exit, but Mocha does

Hi,

I am running a simple test (its failing, but that a separate issue).

Using:

"gulp-mocha": "^1.0.0",

When I run this using Gulp-Mocha (it happens on Travis as well), it does not exit the testing execution, but when I run this using Mocha, it fails, and exits back to the command prompt.

var assert = require("assert"),
    elasticsearch = require('elasticsearch'),
    client;

    client = new elasticsearch.Client();

    describe(' people', function(){

    beforeEach(function(done){

        //in Gulp Mocha this stops the test runner exiting
        //that this does not work is not this issue.
        client.deleteByQuery({
            index: 'people',
            q: '*'
        }, function (error, response) {
            done();
        });


       //If i just do done(), it will exit. in both.
       //done();

    });

    describe('add a entry into the index', function(){
        it('should add Dave as a person to the database', function(done){
            assert.equal(1,1);
        });
    });
});