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

Issue #1058424 by thijsvdanker: Port date mapper patch to d7 version to support dates before 13 Dec 1901

Issue #2339383 by mikran, MegaChriz, joelpittet: Items missing from feeds do not affect item hash even when action is taken based on that

Issue #2419111 by make77, MegaChriz: Configuration option to allow invalid SSL certificates is not used when option "Auto detect feeds" is enabled

Issue #2308343 by MegaChriz, twistor, joelpittet, kruser: File upload disappears with Bootstrap Theme (abuse of #description in theme_feeds_upload())

Issue #2248009 by twistor | djdevin: Fixed Remove the population of ->source_config from FeedsPlugin.

Issue #1062178 by mansspams, MegaChriz, gmclelland, specky_rum, Dave Reid | iccle: Added configuration option to allow invalid/unverified or (self certified) SSL certificates.

Issue #1470530 by stefan.r, GaëlG, mikran, Cottser, gnucifer, MegaChriz, vinmassaro, kostajh, Mithrandir, riho, jaanhoinatski, nrambeck, byronveale, dbassendine, PsycleInteractive, imclean: Added Unpublish/Delete nodes not included in feed.

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 #2224643 by hanoii, MegaChriz: Added Support for input format configuration on a per-field basis .

Issue #1537776 by David_Rothstein | RyFo18: Importing a single 21st century year defaults to the current year.

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

Issue #1033202 by jamesdixon, jamsilver, twistor, james.williams, Steven Jones, vordude, j0rd, mErilainen, gmario, rickmanelius, imclean, dasjo, guillaumev, jlyon, gilgabar, elliotttf, mukesh.agarwal17, patcon, wesnick, Bevan, kreynen, Grayside, fago, spotzero: [Meta] Generic entity processor.