Add docx, xslx, pptx and ppsx to the list of allowed file upload formats

I thinks that mabybe just be easier to allow .rar and .zip, so users could share some format that's not invented today 5 years from now when someone thinks it would be nice to add a different file formatster.

@christefano - it has "odt ods odp" - why would you need anything else? ;)

@stevethewebguy - If we embraced another zipping format I'd really prefer .7z (Free and free and produces similarly small files). That said, I'm not a fan of compressed archive files on g.d.o since it would just be used to mask the actual contents. I'm also not a fan of .zip since it can be used to trick ie mime types.

For now I made g.d.o a copy of d.o's settings. We should try to be relatively consistent in the functionality we provide.

So, d.o webmaster team, what's our standard here?

Is there a good reason not to do it?

This makes sense to me to do. Since there's no patch I think it can/should be a status of "Needs review".

The allowed extensions are defined in features/drupalorg_content_types/drupalorg_content_types.features.field_instance.inc, which means that a patch is necessary, to add more file extensions.