experimental/vim-vam-pathogen-vimrc-support

This patch implements derving a .vimrc from vim-plugins.nix loading those
plugins by either Pathogen or VAM (VAM seems to be slightly faster and is much
more powerful).

Example:

  environment.systemPackages = [
   # default plain vim
   vim_configurable

   # vim which get's called vim-with-addon-nix
   (vim_configurable.customize {
      name = "vim-with-addon-nix";
     vimrcConfig.vam.pluginDictionaries = [{name = "vim-addon-nix"; }];
   })
  ];

This way you can provide an "enhanced Vim" and a standard Vim.

Details about what this commit changes:
1) provide a new toplevel name vimrc which
  * provides a way to build up a .vimrc using either pathogen or VAM (knowing about plugin dependencies by name)
  * can enhance vim to support. vim.customize { name = "name-user"; vam.pluginDictionaries and/or pathogen.pluginNames = .. }
  * introduce rtp names for each vim plugin pointing to the runtimepath path
  * suggest naming to be the same as vim-pi so that VAM's dependencies work
  * derive some packages as example from vim-pi using VAM's new autoload/nix.vim
    supporting simple dependencies
  * test case for vim-addon-nix for VAM/pathogen

2) enhance vim_configurable to support .customize

3) update many plugins by using VAM's implementation not rewriting those which
  * vim-pi doesn't know about the git source yet (TODO: make vim-pi be aware of
    those)
  * have special build code

This commit partially conflicts with commits done by Bjørn Forsman starting by
37f961628b, eg the one using lower case attr and pkg names, because they don't
match vim-pi (eg YouCompleteMe). Rather than resolving the conflict this just
adds aliases so that both names can be used
zfs: Add upstream patch bc151f7 to fix kernel 3.18 builds

Additionally, recognize that the contents of the nix-build.patch are
included in the upstream tree as 3cd33ff and will be released in 0.6.4.
Disable zfs in the ISO for now

It's giving zpool-import.service errors.

http://hydra.nixos.org/build/16883184
pydb: set meta.platforms

To have prebuilt binaries and useful hint from "command-not-found".
youtube-dl: update from 2014.11.04 to 2014.11.12
pkgs: add xsnow
Merge pull request #4962 from robberer/pkgs/xsnow

pkgs: add xsnow
Merge pull request #4897 from MarcWeber/submit/vim-plugins-with-vam-or-pathogen

experimental/vim-vam-pathogen-vimrc-support
xf86_input_wacom: update from 0.26.99.1 to 0.27.0
yoshimi: update from 1.2.4 to 1.2.5
vim-plugins: fix missing deps
coqPackages.unimath: new expression
Merge pull request #4932 from wkennington/master.zfs

zfs: Add upstream patch bc151f7 to fix kernel 3.18 builds