Removed CRAN mirror that was incorrectly handling 404 errors, causing
builder to abort.
Added CRAN archive to R package derivation to prevent R expressions from
breaking when any package is updated.
Fix info command

The "info" command has been broken on NixOS since
457fdb38425fd00378f213f9bd5c306ed99395bf (proving that nobody uses
info).
Merge pull request #3208 from jbedo/master

Fix R expressions when packages are updated
haskell-RSA: update to version 2.0.0
haskell-haskell-token-utils: add version 0.0.0.2
haskell-regex-tdfa-rc: add version 1.1.8.3
haskell-parsers: update to version 0.11.0.3
haskell-vty: update to version 5.1.1
haskell-bloomfilter: update to version 2.0.0.0
haskell-crypto-conduit: update to version 0.5.4
haskell-esqueleto: update to version 1.4.1.3
haskell-libmpd: update to version 0.8.0.5
haskell-pipes-binary: update to version 0.4.0.2
haskell-purescript: update to version 0.5.2.6
haskell-snap: update to version 0.13.2.8
haskell-tasty-golden: update to version 2.2.2.4
haskell-tasty: update to version 0.8.1.3
haskell-twitter-conduit: update to version 0.0.5.2
haskell-websockets: update to version 0.8.2.6