Add pathogen as a sub module
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Add under the bunde directory for vim.

This means that the current pathogen.vim in `~/.dotfiles/vim/autoload/` must be removed and changed out for a symbolic link that points to the real file in `~/.dotfiles/vim/bundle/pathogen/pathogen.vim` file.

We do not track symbolic links in this project, so update the `.gitignore` file and remove the current `pathogne.vim` file from git cache.

Close #1