Add a --glob option to limit output

Add-on to @sontek's [*AMAZING* proutes PR](https://github.com/Pylons/pyramid/pull/1488)

E.g.:

    $ proutes development.ini --glob='user*'
    Name    Pattern                          View                                                                           Method
    ----    -------                          ----                                                                           ------
    user    /profilesvc/v1/user/{user_id}    pyramid.config.views.<pyramid.config.views.MultiView object at 0x106f72bd0>    *
    user    /profilesvc/v1/user/{user_id}    cornice.service.wrapper                                                        GET,HEAD