Checking in changes prior to tagging of version 0.4.3.

Changelog diff is:

diff --git a/History.md b/History.md
index e8a5b10..560be8d 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,7 @@
+0.4.3 / 2013-05-08
+==================
+  * Restore support for PostgreSQL 9.0
+
 0.4.2 / 2013-04-24
 ==================
   * Support injecting functions with callback callconv