What are these symbols in my Vim gutter?

macOS 10.14 Mojave beta 10
NeoVim 0.3.1


I've installed the spf13.vim package from Steve Francia, and while it is excellent, there are a few features that I would like to remove, as Steve himself suggests.

One of which is the ! and + symbols which appear in the gutter in the attached image. They look like they are Git related showing added and deleted lines or something like that.

Can anyone have a look at the image and identify whether it comes from a vim plugin or whether it is from a config setting in .vimrc.

Thanks,
Carl

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