linux: Update to 3.12.24

CVE-2014-4508, CVE-2014-0206.
libxklavier: fix not finding xkbcomp (fixes #3173)

Also refactor the expression a bit,
and add description+license.
xfce4-xkb-plugin: maintenance update
Add mp3splt
Merge pull request #3206 from bosu/mp3splt

Add mp3splt: utility to split mp3 files
ncmpc: update to version 0.22
New pkg: riemann-c-client version 1.1.1

A C client library for the Riemann monitoring system
New pkg: syslog-ng-incubator

A collection of tools and modules for syslog-ng
nixos: add 'firebird' group

The firebird module complains without missing 'firebird' group, add it.
Update direnv to v2.4.0
added lua-sec-0.5
elasticsearch: fix darwin build
eclipse: add Eclipse Standard 4.4 Luna
haskell-hspec-attoparsec: new package, version 0.1.0.1