Rebased onto Master and cleaned up an unused namespace

Author: Daniel Hegener

src/MongoDB.Bson/Serialization/Serializers/DictionaryInterfaceImplementerSerializer.cs

@@ -16,7 +16,6 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Collections.ObjectModel;
 using MongoDB.Bson.Serialization.Options;
 
 namespace MongoDB.Bson.Serialization.Serializers
@@ -313,6 +312,7 @@ IBsonSerializer IDictionaryRepresentationConfigurable.WithDictionaryRepresentati
         protected override ICollection<KeyValuePair<TKey, TValue>> CreateAccumulator()
         {
             return Activator.CreateInstance<TDictionary>();
+        }
 
         IList<IBsonSerializer> IChildSerializersConfigurable.ChildSerializers
         {
@@ -324,7 +324,6 @@ IList<IBsonSerializer> IChildSerializersConfigurable.ChildSerializers
                     ValueSerializer,
                 };
             }
-
         }
 
         IBsonSerializer IChildSerializersConfigurable.WithChildSerializer(int serializerIndex, IBsonSerializer childSerializer)
@@ -340,4 +339,4 @@ IBsonSerializer IChildSerializersConfigurable.WithChildSerializer(int serializer
             return null;
         }
     }
-}
+}