[ssh] create a proxy script for codilime.

check if we are connecting to cl-provision from public network, and if
so use juicebox as a gateway.
[dotfiles] remove Vundle.vim submodule.

instead of using a submodule, create a symlink to a Vundle.vim castle.
[vim] wrap colorscheme in try/catch.

when we first clone the repository, our colorscheme isn't available.
Wrapping colorscheme in a try/catch block silences a vim error we'd
get.