Changes

Auth

• Add error code enum for Auth API errors by @jan-tennert in #618
  All rest errors containing a error_code field will now throw a AuthRestException rather than generic BadRequestExceptions, etc.
  AuthRestExceptions contain a errorCode field of the type AuthErrorCode containing all known error codes.
  Two error codes have their own exceptions (but obviously inherit from AuthRestException): AuthWeakPasswordException and AuthSessionMissingException.
  API errors not containing this field will throw the generic exceptions.
• Fix a major bug causing sessions to be refreshed later than they should be in 9b73c03 by @jan-tennert
  The expiresAt property was saved incorrectly, delaying the expiry date.

Realtime

• Use Postgrests propertyConversionMethod for getting the property name of primary keys