vim: supporting multiple sources:
- vim-nox: client-server implementation without X
- latest:  latest mercurial sources (still very stable)
- default: latest release

vim-plugins: Introduce an area to put vim plugins which are worth adding to nix
because they need more effort than just "unpacking". Document that
nijs: Bump to 0.0.7
Update nodePackages

Signed-off-by: Shea Levy <shea@shealevy.com>
Plone: fix for 4.1
plone: 4.1 should use python 2.6
pythonPackages.lxml: added 2.3 version
Ruby 1.9 parallel build sometimes fails due to races.
perlPackages.AlgorithmMerge: new expression
perlPackages.CacheMemcached: new expression
perlPackages.StringEscape: new package
perlPackages.MooseXSingleton: new expression
perlPackages.libintl_perl: new expression
perlPackages.ListUtilsBy: new expression
perlPackages.PlackMiddlewareDebug: new expression
perlPackages.StatisticsBasic: new expression
perlPackages.LogDispatch: new expression
perlPackages.TextUnaccent: new expression
perlPackages.TextTrim: new expression
perlPackages.TextWikiFormat: new expression
perlPackages.CatalystAuthenticationCredentialHttp: new expression