buildNodePackage: add shell hook for development
Add SpiderOak secure backup service.
gnuplot: version bump 4.6.3 -> 4.6.5
gnuplot: add optional Qt terminal
add ps to path for build
vimpc: initial install script
Fix bloomfilter package on 32 bits

The git-annex derivation depends on bloomfilter and it's currently broken on
i686 because of this.  Upstream bloomfilter pull request already sent, this
is for the meantime.
elasticsearch: add support for plugins
Update Serf to 0.6.3
nixos/munin: change activationScript to preStart script

All activation scripts run in serial upon boot and nixos-rebuild switch
etc., in contrast to preStart which run before a service starts, and can
run in parallel with other services.

The munin(-node) activation script is particularly slow. Change it to a
preStart script so that it can run in parallel with other services and
not slow down boot (or nixos-rebuild switch).

This reduces (repeated) "nixos-rebuild test" time from ~16 seconds to ~8
on my (old) laptop.
Merge pull request #3377 from wjlroe/serf-0.6.3

Update Serf to 0.6.3
Merge pull request #3376 from nilcons/bloomfilter

Fix bloomfilter package on 32 bits
Merge pull request #3374 from FlashKorten/vimpc

vimpc: initial install script
Merge pull request #3355 from ttuegel/gnuplot

Update gnuplot and add optional Qt dependency
Merge pull request #3315 from fignuts/master

Add SpiderOak secure backup service.
Merge pull request #3292 from offlinehacker/elasticsearch_plugins

elasticsearch: add support for plugins
Merge pull request #3364 from joelteon/mysql-ps

On Darwin, add /bin/ps to path during MySQL build
Merge pull request #3003 from offlinehacker/nixpkg/nodejs/buildNodePackage/shellHook

buildNodePackage: add shell hook for development