Bump Logstash to 1.4.2
gbdfed: add package 1.6
Install all dirs for logstash

Also only patch shebangs in bin/ directory
Package for Open Sans fonts.
Consistently use the package name opensans-ttf everywhere.
fix icu4c build on darwin
haskell-gtk: re-generate after applying NixOS/cabal2nix#70
License, platforms and maintainer for Logstash
git: Update to 2.0.2
Merge pull request #3322 from bennofs/haskell-gtk-gio

haskell-gtk: re-generate after applying NixOS/cabal2nix#70
Merge pull request #3324 from linquize/git-2.0.2

git: Update to 2.0.2
added gpodder package
Add gimpPlugins.focusblur
Revert "asciidoc: properly differentiate the "-full" variant in meta.description"

I changed my mind about this, I no longer think that meta.description
should differ depending on the package configuration. A package
configuration can be very fine grained, and I don't think it's
possible/preferable to describe this in meta.description.

This reverts commit 9033821c34d5cd69d814d73413da7a2e5f719d3f.
asciidoc: add enableExtraPlugins expression argument

'enableExtraPlugins = true' enables all the extra plugins (filters and
backends) that are available in the expression. This simplifies the
configuration for users who want to have the fullest possible asciidoc
configuration (not needing to enable each individual plugin).
haskellPackages.engineIO: Update to 1.0.2
haskellPackages.engineIO/engineIOSnap/socketIO: Update to latest versions
Add plugins haskell package
Fix service to use logstash new directory layout
Adding a missing instruction for EFI installations

This commit also adds a link to rEFInd which is a useful tool to manage
EFI systems. If this link is not desired, I can remove it.