(CPR-65) Add nightly repos key to release packages

This commit adds the public key to the nightly repos package. It is
added similarly to the main apt public key to /etc/apt/trusted.gpg.d for
debian and /etc/pki/rpm-gpg on redhat. The post-inst for deb is updated
to add this new key.
(maint) Update deb_dists lists for the current reality

This removes quantal, raring, saucy, sid and unstable from the deb_dists
list.
(maint) Bump release
Merge pull request #12 from haus/ticket/master/cpr-65-add-nightly-repos-key

(CPR-65) Add nightly repos key to release packages