Add subtitle option for ffmpeg.
Merge pull request #2408 from scubed2/ffmpeg

Add subtitle support to ffmpeg
xbmc: 12.3 -> 13.0

- add support for vaapi, bluray
- depend on gnutls
- by default enable pulseaudio
Changed URL to upstream, as the old URL was dead
r-packages.nix: add an auto-generated list of all CRAN packages
all-packages.nix: move all R-related attributes into one place
cosmetic: move the R-wrapper into its own directory
Move r-packages.nix into the r-modules directory.
R: don't install the "recommended packages"

These packages come with R, but if we install them as part of this build, then
we cannot update them without re-building R as well. Instead, we add those
packages to the R environment through the r-wrapper. This means that
recommended packages can be updated in cran-packgaes.nix, and those updates
have an effect on the installation without re-building R itself.
haskell-defaults: prefer cabal-install 1.20.x on ghc-head
haskell-wreq: disable check phase, it requires network
async-2.0.1.3: jailbreak (see http://hydra.nixos.org/build/10766630/nixlog/1/raw)
R: don't restrict meta.platforms to Linux; other architectures should build fine
r-generic-builder: clean up the expression
haskell-wreq: fix reference to attoparsec
Merge pull request #2500 from ikervagyok/testing

URL-Fix
Merge pull request #2501 from bennofs/wreq-disable-check

haskell-wreq: disable check phase, it requires network
Merge pull request #2503 from bennofs/haskell-jailbreak-async

async-2.0.1.3: jailbreak (see