Disabled all vcs systems but git.

vcs_info was running extremely slowly because it was checking the entire
list of version control systems. Enabled only git and it works much more
quickly.
Turned on zsh completion.

Config from: http://wiki.gentoo.org/wiki/Zsh/HOWTO#Advanced_Tab-completion
Added virtualenv config to .zshrc.
Use full path when calling emacs to avoid using alias.
Use jk as evil escape sequence.
Change to normal-state when saving.