Import CSS classes and pre-input content

— Added “divClass” argument to the component, which can be used to pass
CSS classes to the div containing the datepicker input
— Added “inputClass” argument to the component, which can be used to
pass CSS classes to the datepicker’s input element
— Added option to input the datepicker tag’s content (i.e. @content)
before the input. This can be used to add labels or Bootstrap add-ons
to the input.
Added show, cancel and select events

Added three events to the datepicker component:
— show: Triggered when the datepicker is shown
— cancel: Triggered when the datepicker is closed without selecting a
date
— select: Triggered when a new date has been selected