Checking in changes prior to tagging version "0.2.2".

Changelog diff:

diff --git a/History.md b/History.md
index d1fda0b..eb041f3 100644
--- a/History.md
+++ b/History.md
@@ -1,5 +1,10 @@
 # Revision history for unqlite

+0.2.2 / 2014-05-08
+==================
+
+  * Change version of nan(Exact match with 1.0.0)
+
 0.2.1 / 2014-05-06
 ==================