Use https for default git repo

diaspora/defaults.yaml

@@ -1,7 +1,7 @@
 diaspora:
   systemd:
     web_template: salt://diaspora/files/diaspora-web.service
-  repository: git://github.com/diaspora/diaspora.git
+  repository: https://github.com/diaspora/diaspora.git
   version: master
   install_path: /srv/diaspora