Call unbind method within destroy method

[happyhj]

Description

Should call unbind method within destroy method.
To remove keyValue for hammer.js instance.

Removing dependency of jQuery.fn.data also can be a solution.

Steps to check or reproduce

1. Call movableCoord.prototype.bind method to the element.
2. Call movableCoord.prototype.destory method
3. Bind another movableCoord instance to the same element.
4. Error occurs on line 124 bacause this._hammers[keyValue] is undefined but keyValue is still exists.

https://github.com/naver/egjs/blob/master/src/movableCoord.js#L124

            if (keyValue) {
                this._hammers[keyValue].inst.destroy();
            } else {
                keyValue = Math.round(Math.random() * new Date().getTime());
            }