Update to latest upstream objective-git

rowanj · rowanj · commit 42150f7da63f · 2011-09-24T00:28:14.000+10:00
diff --git a/objective-git b/objective-git
@@ -1 +1 @@
-Subproject commit 24637875e90343cf80b48f81e9aecb9acdce3140
+Subproject commit 53e1ea0d12a62b2279201aa4e723cf8aea35a36f
