Add oxygen-gtk3 and rename oxygen_gtk to oxygen-gtk2.

oxygen_gtk is still kept for backwards compatibility.
nodePackages: add support for recursive dependencies

This is a drop-in replacement that handles nodejs recursive dependencies by
propagating already visited nodejs packages and creating shims for recursive
ones. This implementation handles both, new and old npm2nix output format.
sshpass: Added expression
Merge pull request #4028 from madjar/master

sshpass: Added expression
Small style fixups

In this commit, I modified some files, conforming them to a
idiosyncratic standard - mainly, a template for meta attribs.
Fix #4019
Merge pull request #4032 from copumpkin/xpwn-fix

Fix #4019
Merge pull request #3829 from ruediger/add/oxygen-gtk3

Add oxygen-gtk3.
Merge pull request #4018 from offlinehacker/npm_recursive

nodePackages: add support for recursive dependencies
Updated nodejs packages
php: update from 5.4.31 to 5.4.32, potentially fixes CVE-2014-3587, CVE-2014-3597, CVE-2014-5120
vagrant: update from 1.6.4 to 1.6.5
scala: update from 2.11.0 to 2.11.1
qrencode: update from 3.4.3 to 3.4.4
pv: update from 1.5.3 to 1.5.7
pmd: update from 4.2.5 to 4.2.6
panotools: update from 2.9.18 to 2.9.19
liboauth: update from 1.0.2 to 1.0.3, potentially fixes CVE-2013-4390
libmicrohttpd: update from 0.9.35 to 0.9.37
ircdHybrid: update from 7.2.2 to 7.2.3, potentially fixes CVE-2013-0238