Announcements

Announcements are now imported (albeit without their date — Canvas won't let you pre-date an announcement). No effort is made to order them — although I suspect that they are int the manifest in the order they were made, so they should show up in Canvas in a similar or reverse order. The receipt may not yet reflect it, but the original release date for announcements will be included in the receipt.

Signed-off-by: Seth Battis <SethBattis@stmarksschool.org>