Issue #1621602 by MegaChriz, twistor: Fixed 'Could not retrieve title from feed' error message for parsers that cannot provide a title from the source.

- DRUPAL-7--1-0-alpha2 http://github.com/lxbarth/feeds/tree/DRUPAL-7--1-0-alpha2
and
- DRUPAL-7--2-0-alpha1 http://github.com/lxbarth/feeds/tree/DRUPAL-7--2-0-alpha1

  language, user properties from parent feed node. Note: Signatures of
  FeedsProcessor::map(), existingItemId(), FeedsParser::getSourceElement()
  changed.

#701432 pounard, Will White: PHP 5.3: array_shift() expects parameter 1 to be array, null given in (...).

  formalize feed elements.