A method for programmatically selecting a period of time.
.fullCalendar( 'select', start, [ end ] )
start is a Moment or anything the Moment constructor accepts.
end parameter is exclusive, meaning if you want to your last
full-day selection to be Thursday, then specify Friday.
end parameter is optional.
For the agenda views, whether the selection is "all-day" or not is determined by whether the
given dates have an ambiguous time.
A string like
"2014-01-22" has an ambiguous time and will result in an all-day selection.