Remove unused and under-used plugins

Argumentative - never used in production even once

CtrlP - used to use, haven't touched in months

Exchange - never used in production even once

Twig - only needed on one server to edit someone else's code

Undotree - used only once for something that should have been in Git
anyway

Vimperator - almost never used

1 files changed, 0 insertions, 0 deletions

diff --git a/vim/bundle/ctrlp b/vim/bundle/ctrlp
deleted file mode 160000
-Subproject b5d3fe66a58a13d2ff8b6391f4387608496a030