update vundle
vim: gist plugin
vim: gist plugin
vim: add jellybeans plugin back
vim: better swp/backup dir setup
vim: f instead of z for latex mappings

z mappings make my pinky hurt :(
vim: make [/] usable in latex again

At some point, z9 mapped to [ and z0 to ] or something, so I disabled
[/] so I would use the other mappings, but now I don't have the original
mapping, which means if I no-op [/] I can't enter [/].