Added SelectionMode as an Enum and implemented SelectionMode.PERIOD to select two dates.
Corrected indention and put Selectionmode in CalendarpickerView
Added another SelectionMode which also selects all days in between the selected period.
included feedback stuff of @edenman and some optimizations
merged fix-broken-test
merged fix-set-selected
Merge remote-tracking branch 'upstream/master'
extended example
Merge pull request #23 from tobiasschuerg/master

Period selection added.