Rename namespace class to {package.name}Package

Conflicts:

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

compiler/testData/compileJavaAgainstKotlin/method/IntegerArray.java

@@ -1,6 +1,6 @@
 
 class IntArray {
     {
-        Integer[] r = namespace.doNothing(new Integer[0], null);
+        Integer[] r = _DefaultPackage.doNothing(new Integer[0], null);
     }
 }