Text input keeps focus after picker is closed

The text input field of the colorpicker retains focus after the picker popup is closed. This in itself is not a problem, but the next click anywhere on the page makes the field lose focus, firing the blur handler and changing the selected color.

I don't know how hacky it is, but adding `$mColorPickerInput.blur()` into `$.fn.mColorPicker.closePicker` solves the issue.
