don't use test.begin

the PPA we use on Travis CI doesn't have CasperJS 1.1.0-DEV yet, so
we're better off not using it for now.

IPython/html/tests/casperjs/test_cases/shutdown_notebook.js

@@ -2,26 +2,30 b''
 // Test shutdown of a kernel.
 //
 casper.notebook_test(function () {
-    this.test.begin("shutdown tests (notebook)", 2, function(test) {
+    // XXX: test.begin allows named sections but requires casperjs 1.1.0-DEV.
+    //      We will put it back into place when the next version of casper is
+    //      released. Following that, all instances of this.test can be changed
+    //      to just test.
+    //this.test.begin("shutdown tests (notebook)", 2, function(test) {
 
-    casper.thenEvaluate(function () {
+    this.thenEvaluate(function () {
         $('#kill_and_exit').click();
     });
     
-    casper.thenEvaluate(function () {
+    this.thenEvaluate(function () {
         var cell = IPython.notebook.get_cell(0);
         cell.set_text('a=10; print(a)');
         cell.execute();
     });
 
     // refactor this into  just a get_output(0)
-    casper.then(function () {
+    this.then(function () {
         var result = this.get_output_cell(0);
-        test.assertFalsy(result, "after shutdown: no execution results");
-        test.assertNot(this.kernel_running(), 
+        this.test.assertFalsy(result, "after shutdown: no execution results");
+        this.test.assertNot(this.kernel_running(), 
             'after shutdown: IPython.notebook.kernel.running is false ');
     });
 
-});
+//}); // end of test.begin
 });