Allow nix-env recurse into vimPlugins
Add automatic plugin activation for vim
Add several vim plugins

Added are:
* ctrlp
* vim-a
* colorsamplerpack
* yankring
Remove wrapVim

I don't see a reason for having wrapVim function and vimWrapper and
vimHugeXWrapper packages. If you need a system vimrc, whats wrong with
``environment.etc."vimrc".text`` ?

Also strictly speaking ``vimHugeXWrapper`` didn't wrap, X-version
properly. I.e. running ``gvim`` have console vim version.
vim: Implement sourcing /etc/vimrc and /etc/vim/vimrc
vim: Update vim to 7.4.335
vim: Add `syntax on` and `set nocompatible` by default

Its what everybody wants in 2014. They are enabled by default both in
ubuntu and archlinux.