Separation of SignIn/SignUp forms
Merge pull request #236 from lipis/auth_split

Separation of SignIn/SignUp forms (fixes #229)
Showing verified icon only when needed
Used Flask-RESTful for API.
Fix fields type.
Improved API errors handler.
Added request.query_string value to JSON link.
Added 'check_unique_email' field to config API.
Sorted properties in CONFIG_FIELDS.
Added recaptcha fields.
Minor fix.
Sorted User fields.
Update CONFIG_FIELDS.
Added Auth API.