Added concatMapStringsSep and concatImapStringsSep

Example: configure rewrite rules for Mediawiki

    RewriteEngine On
    RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f
    RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d
    ${concatMapStringsSep "\n" (u: "RewriteCond %{REQUEST_URI} !^${u.urlPath}") serverInfo.serverConfig.servedDirs}
    RewriteRule ${if config.enableUploads
Bump the amount of memory for the installer test

It randomly OOMs.

http://hydra.nixos.org/build/13587153
pythonPackges.ipython: 2.0.0 -> 2.2.0
pythonPackages.matplotlib: don't depend on pygtk
IDEA: 13.1.3 -> 13.1.4

Changed, attribute name separator changed to dashes and decription.
Added longDescription.
pythonPackages.jsonschema: 2.0.0 -> 2.4.0
pythonPackages.memcached: 1.48 -> 1.51
pythonPackages.sqlalchemy{8,9}: bump
Merge pull request #3778 from edwtjo/idea-13.1.4

IDEA: 13.1.3 -> 13.1.4
Moo: Fix build

http://hydra.nixos.org/build/13626782
Fixed rewrite rules for Mediawiki

If Mediawiki was served from the root directory of the server
it was impossible to serve other directories.

Make sure that URLs defined in servedDirs are not rewritten.
Use case: serving local copy of MathJax
haskell-MonadRandom: update to version 0.2.0.1
haskell-HTTP: update to version 4000.2.18
haskell-arbtt: update to version 0.8.1.2
haskell-http-client: update to version 0.3.7.2
haskell-language-c: update to version 0.4.6
haskell-stylish-haskell: update to version 0.5.10.2
haskell-yesod-core: update to version 1.2.19.1
network-uri: build with a recent version of Cabal on GHC 6.x
Build cabal-install-0.14.0 with network 2.3.x on GHC 7.4.2 and below.

Fixes <https://github.com/NixOS/nixpkgs/pull/3770>.