Remove NeoBundle check

Well that was short-lived.

`:NeoBundleDepends` [was removed](https://github.com/Shougo/neobundle.vim/commit/7e644cdac22752345eca21d0cd54930a6cedc74a), leaving me uncertain as to how to declare a dependency within a plugin. I think we may need to fork [neobundle-vim-recipes](https://github.com/Shougo/neobundle-vim-recipes) and add a recipe instead, but I'm currently unable to get recipe functionality working (Windows box, curl issues, etc.).