Rename namespace class to {package.name}Package

Conflicts:

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

compiler/testData/compileJavaAgainstKotlin/method/Vararg.java

@@ -4,6 +4,6 @@ import java.util.ArrayList;
 class Vararg {
     {
         List<String> list = new ArrayList<String>();
-        List<String> r = namespace.gg(list, 3, 4, 5, 6);
+        List<String> r = _DefaultPackage.gg(list, 3, 4, 5, 6);
     }
 }