Issue #2942050 by jenlampton: PHP fatal during update: call to undefined iframe_field_info
backported #2944309 by Daniel Korte: Grammar, spelling
Issue #2888623 by osopolar: Backport use of percentage for iframe width to Drupal 7
Issue #2768819: Shows redundant URL= and SRC= in code
Issue #2849010 by volkswagenchick: README for 7.x-1.x branch