unittest step2: bye bye to multiple entrypoints for unittest

lib/unittest/vm_config.dart

Index: lib/unittest/vm_config.dart
diff --git a/lib/unittest/unittest_vm.dart b/lib/unittest/vm_config.dart
similarity index 81%
rename from lib/unittest/unittest_vm.dart
rename to lib/unittest/vm_config.dart
index b5ee9254c481e6c99a83e287a6deada7eed4928e..dcf50007cd8151058c393f6f321d71569521a15d 100644
--- a/lib/unittest/unittest_vm.dart
+++ b/lib/unittest/vm_config.dart
@@ -8,12 +8,9 @@
 #library('unittest');
 
 #import('dart:io');
-#import('dart:isolate');
+#import('unittest.dart');
 
-#source('config.dart');
-#source('shared.dart');
-
-class PlatformConfiguration extends Configuration {
+class VmConfiguration extends Configuration {
   void onDone(int passed, int failed, int errors, List<TestCase> results) {
     try {
       super.onDone(passed, failed, errors, results);
@@ -24,3 +21,7 @@ class PlatformConfiguration extends Configuration {
     }
   }
 }
+
+void useVmConfiguration() {
+  configure(new VmConfiguration());
+}