Create THIS_BRANCH_IS_DEAD.txt (#115)

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+Due to some errors with the 5.0.5 and 5.0.6 releases, which contained
+intrusive commits that should not have been made on a stable branch,
+this branch has been retired.
+
+If you came from 5.0.4 or earlier, you can continue on the 5.0.4 branch to get releases 5.0.4.1 and later.
+If you came from 5.0.5 or 5.0.6, you can continue on the 5.2 branch and pick up where this branch left off.