.vimrc: document why I use "map ' `"
.vimrc: add "nmap Y y$" (so that Y behaves similarly to C and D)
.vimrc: s|git://github|http://github| to work around firewall/proxy blocking git port

I found the example here:

  https://raw.github.com/MarcWeber/vim-addon-manager/master/doc/vim-addon-manager-getting-started.txt