Use the public github url for dependencies

buildout.cfg

@@ -19,8 +19,8 @@ prefixes = /idiap/group/torch5spro/nightlies/last/bob/linux-x86_64-release
            /Users/andre/work/bob/b/dbg/
 
 [sources]
-xbob.extension = git git@github.com:bioidiap/xbob.extension branch=prototype
-xbob.blitz = git git@github.com:bioidiap/xbob.blitz
+xbob.extension = git https://github.com/bioidiap/xbob.extension branch=prototype
+xbob.blitz = git https://github.com/bioidiap/xbob.blitz
 
 [scripts]
 recipe = xbob.buildout:scripts