replace pathogen with vundle

What's next: Backup your vim folder and your vimrc. Delete all your plugins and the pathogen stuff.
Add the new .vimrc to your home folder. Start vim. Vundle will be automatically downloaded and installed. Don't worry about the errors you will get, this is just because none of the plugins are installed yet. When vim is ready, type :BundleInstall. Restart Vim. That's it enjoy.