edu(koans): fixes for tests completed 72/74

[GGTuken]

about_asserts.js about_assignment.js about_control_structures.js about_equality.js about_functions_and_closure.js about_numbers.js about_objects.js about_operators.js about_prototypal_inheritance.js about_prototype_chain.js about_reflection.js half done: about_regular_expressions.js about_scope.js about_strings.js about_this.js about_truthyness.js