lessons 7.x-1.0-alpha10

This release includes some changes that were already on drupalladder.org, and recent changes to eliminate the Curriculum node type and add Ladder #1822922: Create new ladder content type to replace curriculum

Changes since 7.x-1.0-alpha9:

• Finished swapping curriculum references out for ladder (Issue #822922)
• Removed the lessons_curriculum module, since the curriculum node tyep is being removed (Issue #1822922)
• #1792964: Removed filter config that was causing an error on the Lessons view
• #1494972: Rename curriculums to ladders across the board
• Fixed old Learn Drupal label
• Initial feature modules for the flags and fields to allow designated curriculum Maintainers to flag lessons within a curriculum as provisional. Some settings changes by Alan Evans.
• Update lists_lists. Fix Curriculums view.
• Update node--lesson.tpl.php. Don't print author picture at top of lesson.