Checking in changes prior to tagging version "0.2.4".

Changelog diff:

diff --git a/History.md b/History.md
index d55ff8d..a92b5a7 100644
--- a/History.md
+++ b/History.md
@@ -1,5 +1,10 @@
 # Revision history for unqlite

+0.2.4 / 2014-06-12
+==================
+
+  * Update docs
+
 0.2.3 / 2014-05-25
 ==================