Rename namespace class to {package.name}Package

Conflicts:

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

compiler/testData/checkLocalVariablesTable/_DefaultPackage$foo$a$1.kt

@@ -0,0 +1,8 @@
+fun foo() {
+    var a = {
+
+    }
+}
+
+// METHOD : invoke()V
+// VARIABLE : NAME=this TYPE=L_DefaultPackage$foo$a$1; INDEX=0