git-annex: 5.20140320

installing git-annex with cabal-install is quite long and requires to install 
some heavy packages. It also has several external lib dependencies and needs a 
few configuration flags to build so it is quite difficult to install too. This
formula should make it easy and quick to install with a bottle.

The huge number of haskell dependencies is built within the formula and
statically linked to git-annex. The haskell libraries built are discarded -
cabal-install should be used instead of this package in order to keep them.