Rename namespace class to {package.name}Package

Conflicts:

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

compiler/testData/compileJavaAgainstKotlin/method/ListOfString.java

@@ -4,6 +4,6 @@ import java.util.ArrayList;
 class ListString {
     public static void gg() {
         List<String> list = new ArrayList<String>();
-        namespace.ff(list);
+        _DefaultPackage.ff(list);
     }
 }