[ITK] Draft of ITK 4.7.1 Release Announcement

[Matt McCormick]

Hi,

Here is a draft of the ITK 4.7.1 release announcement:
  https://docs.google.com/a/kitware.com/document/d/1ou07bykls0VipIxV5xXaXUaphup7ImNgpdzDZVN3anY/edit

Please look it over and make any corrections or additions.  The
release is targeted for early next week.

Thanks,
Matt