Only redirect to HTTPS on GET-requests

Because of the reasons stated in eg. http://stackoverflow.com/questions/7185074/heroku-nodejs-http-to-https-ssl-forced-redirect#comment31642252_7261883
Ignore double slashes in URL:s

Fixes #4

Double slashes are most of the time ignore. Most of the time http://example.com/foo//bar and http://example.com/foo/bar returns the very same page. So whenever a slash is following another slash in the path of a URL they will now be normalized into just a single slash in the normalizing process.
Preparing for a new release