Add ability to select a range of dates#25

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mattgrayson wants to merge 8 commits intopuls:masterfrom

mattgrayson:master

Commits on Apr 23, 2013

Support for selecting date ranges
mattgrayson
committed

Commits on Apr 24, 2013

Commits on Apr 25, 2013

Fixed scrollToDate:animated: to actually scroll to the date
mattgrayson
committed
Tweaked scrollToDate:animated: to preserve @randomstep's change to take into account self.pinsHeaderToTop
mattgrayson
committed

Commits on May 2, 2013

Commits on May 9, 2013

expose buttons on calendar row cell to allow further customization
mattgrayson
committed