Is there a possibility to misuse grab files from a github repo as external resources in jsFiddle?
Another possibility is to add the Git library to the cdnJS Script Repository (they write that any library that is resonably popular on GitHub will be accepted) and then use it as external resource.
Just found out: there are lots of Javascript libraries at http://jsdb.io/ and it's very easy to add new ones there--i's just a matter of entering the URL of a Github repository.