Elixir's mix shouldn't be added to wrapProgram
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.
Add package: simple-tpm-pk11

Simple PKCS11 provider for TPM chips
nixos-iso: Add zfs / btrfs to supportedFilesystems
Update firefox-bin to 33.0
eggDerivation: Move postInstall into installPhase.
firefox-bin: uses sha1 provided by Mozilla
drop permission prestart from polipo service module

chowning the cache directory can timeout the service, permissions
on this directory should never change without user intervention
talloc: Fix linker flags on darwin.

Before this patch, building talloc on darwin (OS X 10.8.5) results in:

gcc -dynamiclib -Wl,-search_paths_first -undefined error -o libtalloc.dylib.2.0.1 ./talloc.o  ./libreplace/replace.o ./libreplace/snprintf.o ./libreplace/getpass.o ./libreplace/strptime.o   -install_namelibtalloc.dylib.2
gcc: error: unrecognized command line option '-install_namelibtalloc.dylib.2'
make: *** [libtalloc.dylib.2.0.1] Error 1

Setting SONAMEFLAG to either "-install_name " (note trailing space), or
"-Wl,-install_name," results in a successful build. The latter seems
more clear.
Pass chickenEggs as a parameter to egg2nix.

Those eggs are specific to egg2nix - it's unwise to make them public.
Wrap chicken so it can find gcc.
notmuch: Use 'find' to patch test script shebangs.