[RFC] vim-patch:7.4.211

Merging vim-patch:7.4.211
~~This PR is for documentation and marks patch 211 as included. ~~

Commit 807494578888d12ce55db67d73948bef208c2695 removed lua support, which automatically fixed the issue described in the patch notes (see https://github.com/neovim/neovim/commit/807494578888d12ce55db67d73948bef208c2695#diff-bfc66cd97afd06b1db0e877bf07713ceL570).

Problem:    ":lu" is an abbreviation for ":lua", but it should be ":lunmap".
            (ZyX)
Solution:   Move "lunmap" to above "lua".

https://code.google.com/p/vim/source/detail?r=e90bef2240c8d187da6e8d8fa5007ec5afc12284