changing borken default url
default url on https
fixing specs
fix new download URL path version component

The new download URL has the major.minor version as a path component but
excludes the .patch. Eg.

    https://selenium-release.storage.googleapis.com/<major>.<minor>/selenium-server-standalone-<major>.<minor>.<patch>.jar
Merge pull request #13 from enxebre/defaul-url