ert repository referenced has no code and is causing el-get-install issues.

Hi,

I tried installing emacs-jedi today and I found that there was an issue with el4t. Specifically, whenever I tried to install el4t indirectly through emacs-jedi, I would get a "submodule update failed" error when trying to install ert. After looking at ert, it looks like there's no code left (https://github.com/ohler/ert), as it was added to Emacs trunk 2 years ago. Removing the reference to ert allowed me to install emacs-jedi with no issues.

Is there a reason you would still like ert to be added? if not, it would be great to remove this.