Handle case in which email is None (as GitHub can provide)
Merge pull request #222 from mdxs/fix_create_user_db

Handle case in which email is None (as GitHub can provide)
Added  rel="nofollow" to order and filter links
Refactoring signin stuff
Merge pull request #223 from gmist/refactoring_signin

Refactoring signin stuff
Renamed resp to response and minor refactor
Merged with gae-init/gae-init-auth: refactoring signin stuff.
Merge pull request #225 from gmist/simplify_signin

Refactoring signin stuff
Merged with gae-init