Force an error if there is an invalid escape sequence in any iCalendar data.
Force an error if there is an invalid escape sequence in any iCalendar data.

git-svn-id: 0c33e958600270102f91bf5868e396345dde476c@3431 e27351fd-9f3e-4f54-a53b-843176b1656c

red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver