Implementation of Tizen SSO APIs

Implementation of SSO APIs as per widl file https://code.google.com/p/accounts-sso/source/browse/widl/signon.widl?repo=libgsignon-glib

Backend that provides core functionality is gSSO and more information about that
component could be found at https://01.org/gsso
```
  if (!propObject.hasOwnProperty(propertyKey))
    return;

  Object.defineProperty(obj, propertyKey, {
    configurable: false,
    enumerable: true,
    writable: false,
    value: propObject[propertyKey]
  });
```