Prefix schema wide message with Any

The schema messages are probably going to generate into a Java
class named after the schema itself, which would conflict with
the message name that holds any of the row message. Prefix that
special message with the name "Any".

Change-Id: I4d314354411beaa09d006b8aa1e938a1701e17c9
diff --git a/src/main/java/com/google/gwtorm/schema/java/ProtoFileGenerator.java b/src/main/java/com/google/gwtorm/schema/java/ProtoFileGenerator.java
index 66f617e..2852337 100644
--- a/src/main/java/com/google/gwtorm/schema/java/ProtoFileGenerator.java
+++ b/src/main/java/com/google/gwtorm/schema/java/ProtoFileGenerator.java
@@ -79,7 +79,7 @@
       generateMessage(r, out);
     }
 
-    out.print("message " + schemaName + " {\n");
+    out.print("message Any" + schemaName + " {\n");
 
     for (RelationModel r : sortRelations(rels)) {
       out.print("\toptional " + getMessageName(r) + " "