nixos/nat: Don't flush tables, create subchains for autogenerated rules
nixos/tests/nat: Modify test to accomodate for firewall consolidation
grails: new package

Grails is an Open Source, full stack, web application framework for the
JVM. It takes advantage of the Groovy programming language and
convention over configuration to provide a productive and stream-lined
development experience.

http://grails.org/
nixos/tests/nat: Add tests for standalone and firewall based nat
Update VirtualBox to 4.3.16.
Leiningen: Bump to 2.5.0.
Merge pull request #4121 from wkennington/master.nat

nixos/nat: Don't flush tables, create subchains for autogenerated rules
strongswan: Fix some hard-coding
Merge pull request #4156 from ambrop72/virtualbox-4.3.16

Update VirtualBox to 4.3.16.
monero: only build on x86_64-linux, fails for i686 on hydra
libav: update all branches, probably with security fixes

(cherry picked from commit ead6603b6037a8ea6d6898241c7ae50888288bd3)
curl: update to 7.38.0, including security (#4161)

Fixes CVE-2014-3620 and CVE-2014-3613.