Add Get/ReleaseReference methods to all pool classes.

diff --git a/OvalePool.lua b/OvalePool.lua
index c33adda..10fd20c 100644
--- a/OvalePool.lua
+++ b/OvalePool.lua
@@ -62,6 +62,14 @@ function OvalePool:Release(item)
 	self.unused = self.unused + 1
 end

+function OvalePool:GetReference(item)
+	return item
+end
+
+function OvalePool:ReleaseReference(item)
+	-- no-op
+end
+
 function OvalePool:Clean(item)
 	-- virtual function; override as needed.
 end
diff --git a/OvalePoolGC.lua b/OvalePoolGC.lua
index 7bb90aa..ae7f5fe 100644
--- a/OvalePoolGC.lua
+++ b/OvalePoolGC.lua
@@ -44,6 +44,14 @@ function OvalePoolGC:Release(item)
 	self:Clean(item)
 end

+function OvalePoolGC:GetReference(item)
+	return item
+end
+
+function OvalePoolGC:ReleaseReference(item)
+	-- no-op
+end
+
 function OvalePoolGC:Clean(item)
 	-- virtual function; override as needed.
 end
diff --git a/OvalePoolRefCount.lua b/OvalePoolRefCount.lua
index f9a7122..cd271ef 100644
--- a/OvalePoolRefCount.lua
+++ b/OvalePoolRefCount.lua
@@ -108,7 +108,15 @@ function OvalePoolRefCount:Get()
 end

 function OvalePoolRefCount:Release(item)
-	item:ReleaseReference()
+	return item:ReleaseReference()
+end
+
+function OvalePoolRefCount:GetReference(item)
+	return item:GetReference()
+end
+
+function OvalePoolRefCount:ReleaseReference(item)
+	return item:ReleaseReference()
 end

 function OvalePoolRefCount:Clean(item)