vim: add pathogen as a plugin loader

The problem was that not all plugins were added properly.
Surely we can fix the adding, but we can always get new bugs.
It's not rational to reinvent something.
Pathogen is a tool that we want.
It just simply add a plugin to a vim's runtime.
It's license is the same as vim has.
So now all the plugins are added properly and easily.
vim-plugins: remove useless information and add current situation