Issue #1183440 by twistor, MegaChriz, stefan.r, drclaw, pcambra, olofjohansson, Calystod, colan, svendecabooter, Bobík, Manish Jain, AdamGerthel, mErilainen, kervi, Pocketpain et al: Multilingual Feeds - Make field import language-aware

Issue #1107522 by MegaChriz, twistor, ditcheva, nielsonm, franz, Niklas Fiekas, cthiebault, Uhkis, gcb, mparker17, guillaumev: Framework for expected behavior when importing empty/blank values + text field fix

Issue #2333029 by twistor, MegaChriz: Extend mapping API to allow for defaults and multiple callbacks

| dasjo: Fixed taxonomy_node_get_terms() doesn't work with drupal 7.

#908964 alex_b: Break out scheduler. Note: Features depends on Job Scheduler module now: http://drupal.org/project/job_scheduler .

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