leveldb: 1.15 -> 1.18
ceph: 0.87 -> 0.88
pcsclite: 1.8.12 -> 1.8.13
dhcp: 4.3.0 -> 4.3.1
btrfs-progs: 3.17 -> 3.17.1
kernel: 3.17.2 -> 3.17.3
kernel: 3.14.23 -> 3.14.24
libnl: 3.2.23 -> 3.2.25
libnl: Remove old 3.2.19 version
Merge pull request #4800 from aherrmann/pr_boost_mpi

boost 1.55: Add Boost.MPI (optional)
pgpool: Add derivation
gtkdatabox: update from 0.9.1.3 to 0.9.2.0
pastebinit: fix build
limit the amount of time ssh-agent keeps a key (default: 1h)
ssh-agent: make key timeout optional
opkg: update from 0.2.3 to 0.2.4
ssh-agent: use types.nullOr
Merge pull request #4981 from NixOS/ssh-agent-timeout

ssh-agent: Limit the amount of time it keeps a key
openra: 20140608 -> 20141029
Merge pull request #4857 from abbradar/cups2

[WIP] Improve printing experience and update related packages