Adjusted the build tests' app delegate to be compatible without a storyboard

Reviewers: featherless, #material_components_ios_owners

Reviewed By: featherless, #material_components_ios_owners

Projects: #material_components_ios_owners

Differential Revision: http://codereview.cc/D74

Author: randallli

build_tests/classes/objective_c/MDCBuildTestAppDelegate.m

@@ -16,9 +16,15 @@
 
 #import "MDCBuildTestAppDelegate.h"
 
+#import "MDCBuildTestViewController.h"
+
 @implementation MDCBuildTestAppDelegate
 
-- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
+  self.window.rootViewController = [[MDCBuildTestViewController alloc] init];
+  [self.window makeKeyAndVisible];
   return YES;
 }