Please review: new wiki page with release instructions

[Mikhail Glushenkov]

Hi,

On 17 March 2015 at 21:43, Johan Tibell <johan.tibell at gmail.com> wrote:
> If someone could let me know when all the needed patches are on the 1.22
> branch (and if we need both a Cabal and cabal-install release), I will make
> the release and take it as an opportunity to validate the release process
> instructions.

I believe I have now fixed all the remaining issues on the 1.22 branch
and we're ready for a new point release.

Herbert, can you please update GHC 7.10 Cabal submodule reference to
the tip of the 1.22 branch?