Merge #2798: stdenv and a few other big updates

Stdenv-changing things:
    - gcc 4.8.2 -> 4.8.3
    - long-running grsecurity branch
Others:
    - pkgconfig update
    - CVE for libtasn1, dbus

Conflicts (simple):
    pkgs/development/compilers/ghc/7.6.3.nix
Update haskell-http-kit to version 0.5.0
Update haskell-aeson-qq to version 0.7.2
Merge pull request #2967 from sol/master

Update haskell-http-kit and haskell-aeson-qq
hscolour-bootstrap: allow setting RTS options for the hscolour binary we use to generate our documentation

Other tools like hsc2hs or haddock allows this, too, and some tools explicitly
set memory limits on these tools during the build (i.e. llvm-general-pure) by
exposing a GHCRTS environment variable. See [1] for a concrete example of this
issue.

[1] https://github.com/NixOS/nixpkgs/issues/2939
haskell-git-annex: update to version 5.20140613
hscolour-bootstrap: GHC 6.10.x and earlier don't support the -rtsopts option
nixUnstable: bump
Fix generation of synergy-{client,server} when disabled
Upgrade zeromq and nanomsg
Org-mode 8.2.7 depends on texlive-cm-super.
Merge pull request #2970 from tailhook/nanomsg_and_zeromq

Upgrade zeromq and nanomsg
rsync: sha256 for the patch was updated
conkeror: upgrade to latest snapshot
add emacs-metaweblog
emacs-org2blog: upgrade to 0.8.1
idris: provide boehmgc to compile with llvm backend
emacs-idris-mode: upgrade to 0.9.13.1
nginx: add echo module, fix aio on linux&freebsd
nixos/nginx: fix group and stateDir permissions

furthermore, I don't think adding nginx to systemPackages is of any use.