As requested, signed gitian builds for tags:

v0.4.9rc3
v0.5.8rc3
v0.6.5rc3
v0.7.3rc3

The key I'm using is a fresh one created for this (and other) code-
signing purposes, and I have signed it with my primary otc key for
introductory linking.

I have not yet done any actual testing with these bitcoind, except to
verify they execute on the machine that built them. More testing
comes later.