Fix bug 848424 - Show EXDATE and modified occurrences in email invitation template. r=mmecca

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extra : rebase_source : f1172362fca8f1468e06e3c2a241a3b5dc50161a
Fix bug 687412 - "Save Event" dialog pops up when closing an unmodified event. r=mmecca

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extra : rebase_source : 9a65b5deedc6bb70c103e8da61e26fcbe24f1b8d