Use mousedown to prevent a focusout firing before click is handled

[dhiemstra]

When specifying colorSelectors and initializing the plugin directly on an <input> tag the focusout event is triggered which closes the colorpicker and causes the whole colorSelector click handler not to be fired.

This can be fixed to observe the mousedown instead of click.

I've also added a preventDefault() on the click event to make it work smoother within a dropdown / modal because the click now causes the parent dropdown to close.

[itsjavi]

Thanks I will merge it