Added the ability to use an IEnumerable<T> when adding to a list, so you can do:

new Foo.Builder {
   RepeatedValue = { x.Select(y) }
};

... a bit like LINQ to XML.
diff --git a/src/AddressBook/AddressBookProtos.cs b/src/AddressBook/AddressBookProtos.cs
index 8caf0f6..5c69ace 100644
--- a/src/AddressBook/AddressBookProtos.cs
+++ b/src/AddressBook/AddressBookProtos.cs
@@ -668,7 +668,7 @@
         return this;
       }
       
-      public scg::IList<global::Google.ProtocolBuffers.Examples.AddressBook.Person.Types.PhoneNumber> PhoneList {
+      public pbc::IPopsicleList<global::Google.ProtocolBuffers.Examples.AddressBook.Person.Types.PhoneNumber> PhoneList {
         get { return result.phone_; }
       }
       public int PhoneCount {
@@ -910,7 +910,7 @@
       }
       
       
-      public scg::IList<global::Google.ProtocolBuffers.Examples.AddressBook.Person> PersonList {
+      public pbc::IPopsicleList<global::Google.ProtocolBuffers.Examples.AddressBook.Person> PersonList {
         get { return result.person_; }
       }
       public int PersonCount {