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
Minor fix
Fixed typo
Added input-group support
Merge pull request #226 from lipis/input-groups

Added input-group support
Merged with gae-init