fix(core): Return promise from handleWindowResize
method
#4512
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Current documentation says Grid.prototype.handleWindowResize returns a Promise (https://github.com/angular-ui/ui-grid/blob/fe00489/src/js/core/factories/Grid.js#L263) but in fact the internal Grid.prototype.handleWindowResize method was never returning the Grid.prototype.queueRefresh promise (https://github.com/angular-ui/ui-grid/blob/fe00489/src/js/core/factories/Grid.js#L1513). This fix allows ui-grid users to wait until the grid is correctly sized before performing certain actions (like scrolling) which require an accurately-sized grid.