Fixed iOS 5.0 support
Added method to delegate:
- calendarPicker:shoudSelectDate:withState:
Fixed podspec
delegate and dataSource fixed from strong to assign
Fixed podspec
Fixed properties attributes
Example updated for Xcode 5 and iOS7
Fixed crash bug https://github.com/k06a/ABCalendarPicker/issues/28
Merge branch 'Source/master'

Conflicts:
	ABCalendarPicker.podspec
	ABCalendarPicker/ABCalendarPicker.h
	ABCalendarPicker/ABCalendarPicker.m
TK modifications