python: add python.interpreter attribute
dmd: update to 2.066.1
bitcoin(d): fix builing on hydra and with boost 1.56
racket: update to 6.1.1
fix missing sha and rev
Adds bluefish

Bluefish is a powerful editor targeted towards programmers and
webdevelopers, with many options to write websites, scripts and
programming code.

Homepage: http://bluefish.openoffice.nl/
buildPythonPackage: add python to propagatedBuildInputs

Doing:

$ nix-shell -p pythonPackage.pyramid

now also sets $PYTHONPATH. Previously you'd have to do:

$ nix-shell -p pythonPackage.pyramid python
Initial documentation for Python packaging. Feedback welcome.

cc @chaoflow @offlinehacker @garbas @goodwillcoding @brodul
@cillianderoiste @matejc

Fixes #64
Merge branch 'python/docs'
Merge pull request #4980 from henrytill/racket

racket: update to 6.1.1
rdmd: update to new version

Source of old version was not available anymore. Update also depends on
newer version of dmd.
Merge pull request #4978 from abbradar/bitcoin-fix

bitcoin(d): fix builing on hydra and with boost 1.56
Merge pull request #4976 from BlackEdder/pr-dmd

dmd: update to 2.066.1
release-lib: add option to use another package set
Use libusb-compat instead of unmaintained libusb

Close #4945.
valgrind: Fix running under grsecurity
zeromq: renamed package from zmq
Merge pull request #4982 from gavinrogers/master

zeromq: renamed package from zmq
kernel: Don't enable the iommu by default as this breaks for some hardware
Development tools: added atom-shell