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.
move code to be reused to build cabal programs in CabalFormula
darcs: 2.8.4
pandoc: 1.12.3
git-annex: add 5.20140320 bottle.
darcs: add 2.8.4 bottle.
pandoc: add 1.12.3 bottle.