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

Issue #2397219 by joachim, MegaChriz: docs for my_module_mapper_unique() don't match implementation in tests

Issue #2397199 by joachim, MegaChriz: summary line for hook_feeds_processor_targets_alter() docs mentions nodes & is too long

Issue #661606 by MegaChriz, twistor, Cottser, scottrigby, manojbisht_drupal, Mohammed J. Razem, agileadam, emilyf, tmsimont, bradjones1, hairqles, ldavisrobeson, selim13, a.ross, chromix, g089h515r806 | lunk_rat: Added Support unique targets in mappers.

Issue #1827780 by pfrenssen: Type hinting missing from hook_feeds_parser_sources_alter() callback example.

- 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.

#783098 elliotttf: Introduce hook_feeds_user_processor_targets_alter(), mapper for user profile fields.

Try to add README.txt to front page via @verbinclude. #fail.