Removes urls that don't have a basename from releaselinks

https://bitbucket.org/hpk42/devpi/issue/63/500-error-for-get-request-of-test-dev
Uses pypi conversion from - to _ in egg/wheel version in filename

https://bitbucket.org/hpk42/devpi/issue/68/500-fail-file_upload-of-python_inotify