Separating auth related modules
Merge pull request #233 from lipis/oauth

Separating OAuth modules
Pre-release version 1.4.1
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.