profile page: icon and hover explanation for auths
Merge pull request #241 from joernhees/profile-auths

profile page: icon and hover explanation for auths
log emails which are sent on dev-server

better style to see what will happen in production and also nice for trying
sign up / pw reset / email change token emails.
Merge pull request #243 from joernhees/log-emails

log emails which are sent on dev-server
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.