Elixir's mix shouldn't be added to wrapProgram
pythonPackages.cvxopt: added package
python: make 2.6 and 2.7 expr similar, introduce includeModules

When includeModules is true, python is built with all optional modules
as part of derivation.
pythonFull -> python with all modules, pythonFullWithPkgs -> buildEnv
logstash service: make log verbosity configurable.
chicken: Implement support for bootstrap-builds

This is necessary in order to apply custom patches, as chicken needs a
bootstrap build to regenerate *.c files. This is also necessary when
building from git.
Infrastructure to build chicken eggs.
Implement patches.nix to override parts of a derivation
rename patches -> overrides
Add chicken to PATH of wrapped chicken binaries.
New package: egg2nix.

Generates nix-expressions from Chicken Scheme Eggs.
Add package: opencryptoki

Make tpm-tools depend on opencryptoki as well.
Add trustedGrub package.
haskell-packages.nix: switch network library to version 2.6.x
haskell-machines-directory: add version 0.0.0.1
haskell-machines-io: add version 0.1.0.0
haskell-codex: update to version 0.2.0.2
haskell-Elm: update to version 0.13
haskell-cmdargs: update to version 0.10.11
haskell-packages.nix: update default to optparse-Applicative 0.11.x

And try what happens if we remove version 0.9.x.