Gitignore to stop git complaining after byte compilation

My emacs configuration (@jjl/elisp) uses your module as a git submodule. Today I added a Makefile that compiles the elisp i've written and that i depend on (to reduce the startup time of my emacs config, which is getting to be quite excessive given the number of modules I pull in). Unfortunately because you don't have a .gitignore with *.elc in (actually, you don't have a gitignore at all), this causes git to flag changes in the submodule as follows:

    # Changes not staged for commit:
    #   (use "git add <file>..." to update what will be committed)
    #   (use "git checkout -- <file>..." to discard changes in working directory)
    #   (commit or discard the untracked or modified content in submodules)
    #
    #	modified:   vendor/coffee-mode (untracked content)

There are six such modules at current, which is quite distracting when doing a git status. The only reasonable things I could do to resolve this problem (given that I use my emacs config over a handful of machines, not just one) were:
- Fork your repo and submodule the fork with the gitignore fixed
- Submit the gitignore directly to you.

Obviously I've gone the latter route. Please save me from having to maintain quite so many forks of elisp modules.

Thanks,
James