fix AbstractObjectFactory's singleton dispose order

* using stable collection and reversing it before traversal
* also remove .gitattributes

.gitattributes

@@ -1,22 +0,0 @@
-# Auto detect text files and perform LF normalization
-* text=auto
-
-# Custom for Visual Studio
-*.cs     diff=csharp
-*.sln    merge=union
-*.csproj merge=union
-*.vbproj merge=union
-*.fsproj merge=union
-*.dbproj merge=union
-
-# Standard to msysgit
-*.doc	 diff=astextplain
-*.DOC	 diff=astextplain
-*.docx diff=astextplain
-*.DOCX diff=astextplain
-*.dot  diff=astextplain
-*.DOT  diff=astextplain
-*.pdf  diff=astextplain
-*.PDF	 diff=astextplain
-*.rtf	 diff=astextplain
-*.RTF	 diff=astextplain

src/Spring/Spring.Core/Objects/Factory/Support/AbstractObjectFactory.cs

@@ -2466,7 +2466,9 @@ namespace Spring.Objects.Factory.Support
             {
                 // copy the keys into a new set, 'cos we are going to modifying the
                 // original collection (_singletonCache) as we destroy each singleton.
-                ISet keys = new HashedSet(singletonCache.Keys);
+                // we also want to traverse the keys in reverse order to destroy correctly
+                ArrayList keys = new ArrayList(singletonCache.Keys);
+                keys.Reverse();
                 foreach (string name in keys)
                 {
                     DestroySingleton(name);