Add Riak 1.3.1

This modifies how the `riak` and `riak-admin` scripts work such that one has to specify environment variables for where the data, log, and etc directories live.
Fix up the description a bit
haskell-pipes: use camelCase to name pipes packages, rather than separating words with hyphens
Add rmlint, a tool for removing duplicate files
rmlint: Remove unneeded dependency
Merge pull request #605 from bencahill/master

Add rmlint, a tool for removing duplicate files
Merge pull request #587 from orbitz/add-riak-1.3.1

Add Riak 1.3.1
Merge pull request #596 from ocharles/master

 haskell-pipes: use camelCase to name pipes packages, rather than separating words with hyphens
Fix typo :(
riak: this is really strange. Lets hope this hash difference isn't malicious :(
linux-3.9: upgrade to 3.9.5
add hsshellscript
firefox: enable the (enabled by default) elf hack

It's supposed to speed things up but had some troubles in the past
that seem to have been fixed
haskell-accelerate: update to version 0.13.0.4
haskell-contravariant: update to version 0.4.1
haskell-entropy: update to version 0.2.2.1
haskell-ghc-vis: update to version 0.7.1
nijs: Bumped to 0.0.6
Merge branch 'master' of github.com:NixOS/nixpkgs
bind: avoid build impurity by explicitly enabling/disabling features

The BIND configure script finds extra dependencies in /usr/include and /usr/lib,
and activates additional features if it does. This may cause the build to fail
on systems that cannot use a chroot environment. Actively disabling those
additional features prevents this issue from occurring.