haskell-spawn: new package, v0.3
haskell-io-memoize: new package, v1.0.0.0
haskell-hspec2: new package, v0.3.0
Merge pull request #2893 from soenkehahn/master

New Haskell packages
Fix configuring httpd with custom user/group.
lilypond: cosmetic changes
all-packages.nix: cosmetic changes
haskell-libmpd: test suite build is broken by recent hspec update
Revert "Fix configuring httpd with custom user/group."

This reverts commit 08f9da2e8eb9d3da39a1f28e191bd4fb7fd2fa45.
Fix configuring apache with extra user/group

This fix is consistent with all the other modules.
Fix trying to add users to non-existent groups
esniper: update to version 2.31.0
mssql support for php-5.4

small changes to freetds
see: http://www.php.net/manual/de/mssql.setup.php
nix-prefetch-git: fix printing of revision

If the user explictly gives a ref such as "refs/heads/master", `git
rev-parse` failed because we only checked out the `fetchgit`
branch. Now, we also try `git rev-parse fetchgit` if the first call
fails, which fixes the issue.
nix-prefetch-{bzr,hg,svn}: print fetched revision
Merge pull request #2899 from bennofs/nix-prefetch-revision

nix-prefetch-*: print fetched revision
haskell-pipes-text: new expression
firefox: bump to 30.0.
teamviewer: fix broken links (close #2901)
lib: Do not take string context into account

Close #2883.