Rename namespace class to {package.name}Package

Conflicts:

	compiler/jet.as.java.psi/src/org/jetbrains/jet/asJava/JavaElementFinder.java

compiler/testData/writeSignature/ListOfStar.kt

@@ -1,7 +1,7 @@
 fun listOfStar(): List<*> = throw Exception()
 
 
-// method: namespace::listOfStar
+// method: _DefaultPackage::listOfStar
 // jvm signature:     ()Ljava/util/List;
 // generic signature: ()Ljava/util/List<Ljava/lang/Object;>;
 // kotlin signature:  ()Ljet/List<?Ljava/lang/Object;>;