rubygems/rubygems — pull request #225 by amatsuda (2011-12-05 08:02:19+00:00)
Title: Allow `cleanup` command to take comma-separated gem_names

When we run `gem up`, it outputs something like this:

```
Gems updated: RedCloth, bson, childprocess, columnize, everywhere, factory_girl...
```

What I usually do next is to check what's updated, then cleanup the outdated installations.
Apparently the easiest way for doing this is to copy the updated gem_names from STDOUT above and pass it to the `cleanup` command, but that doesn't work as expected.
So, here's a patch for `cleanup` command to accept comma-separated gem_names for realizing this operation.