Get name of repository from URL. ([name])

Similar: [basename], [fullurl].

$ egit basename

$ egit basename extra-git
extra-git

$ egit basename nodef/extra-git
extra-git

$ egit basename github.com/nodef/extra-git
extra-git

$ egit basename https://github.com/nodef/extra-git
extra-git

[name]: https://github.com/nodef/extra-git/wiki/name
[basename]: https://github.com/nodef/extra-git/wiki/basename
[fullurl]: https://github.com/nodef/extra-git/wiki/fullurl