Fixed redirect issue that user would always be redirected to "/" after sign up
Added validation for username length and password length in sign up form
Added validation for username length and password length in sign up form
Reusable gravatar component
Lint clean the code.
Change to user / userId
Refactor code with reuse.
Merge pull request #436 from shaialon/gravatar-component

Turn Gravatars from random helpers into a component
Merge pull request #433 from steffenstraetz/master

Fixed issue that user would always be redirected to "/" after sign up and enables validation.