Untrack automatically generated files

[Partmedia]

While the files generated by autoconf should be shipped in the release tarballs, they really shouldn't be present in Git. Different versions of autoconf on different operating systems will change these files, creating unnecessary churn. Much in the way that object files are not included in the source repository, configure and its friends shouldn't, either.

Update .gitignore to reflect this change.

This requires that developers run autoreconf -i themselves to generate the build system.

[kamalmostafa]

Agreed. I've merged your patch, with these minor changes to your .gitignore delta:

• omitted "*.swp"; users who prefer that behavior for vim temp files should set it in their ~/.gitignore
• used an initial "/" for the top-level filenames
• explicitly listed each of the "/config.*" files instead of using a wildcard

Thanks very much, Kevin!