vim: Switch to vundle
vim: Get persistent undo working
vim: Remove unrelated comments from .vimrc
vim: Use sensible.vim

Use sensible.vim to set default configuration.

Remove my config settings that conflict with sensible.vim's. I might add
my own settings back later if I don't like these defaults.
vim: Comment vimrc
vim: Remove unused stuff from vimrc
vim: Disable ignorecase

It's painful to use vanilla vim when I'm used to this setting.
vim: Verbosify vimrc
vim: Enable eager scrolling
vim: Comment indentation config