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.
ati-driver: Fix "Catalyst Control Center"
Add package: simple-tpm-pk11

Simple PKCS11 provider for TPM chips
nixos-iso: Add zfs / btrfs to supportedFilesystems
Making hydra build ddd.

(cherry picked from commit 4ba671ff113844267dbad307f8a5cbf8ac1d0f52)
Travis: Make it work with non-PR
Travis build: source environment before build

:poop:
fix eval