Multiple answer type now reads in manually written examples for each …

…exercise from example-class elements in the solution area. Fixes #973.

khan-exercise.js

@@ -720,7 +720,7 @@ function makeProblem( id, seed ) {
 	// Add the problem into the page
 	jQuery( "#workarea" ).toggle( workAreaWasVisible ).fadeIn();
 	jQuery( "#answercontent input" ).removeAttr("disabled");
-	if ( validator.examples ) {
+	if ( validator.examples && validator.examples.length > 0 ) {
 		jQuery( "#examples-show" ).show();
 		jQuery( "#examples" ).empty();
 

utils/answer-types.js

@@ -484,6 +484,10 @@ jQuery.extend( Khan.answerTypes, {
 			return valid;
 		};
 
+		ret.examples = solutionarea.find( ".example" ).remove()
+			.map(function(i, el) {
+				return jQuery( el ).html();
+			});
 		ret.solution = solutionArray;
 
 		return ret;