Expanded array tests, read more

Getting the array's length is still not available yet, so I'm not
marking arrays as done - but everything that is there is tested.

I've also tweaked the assert output callbacks to also print 'assert failure'.

tests/integrations/test_keyword_while.toy

@@ -0,0 +1,25 @@
+//TODO: test keyword 'while', 'break', 'continue'
+
+{
+	//iteration
+	var iteration = 0;
+	while(iteration < 10) {
+		print iteration;
+		iteration += 1;
+	}
+}
+
+
+{
+	//if and while work together
+	var count = 1;
+	while (count <= 10) {
+		if (count % 2 == 0) {
+			print "even";
+		}
+		else {
+			print "odd";
+		}
+		count += 1;
+	}
+}