Bump version to 0.9.2

A *real* release this time, with NEWS, ChangeLog, etc.
diff --git a/THANKS b/THANKS
new file mode 100644
index 0000000..940cfde
--- /dev/null
+++ b/THANKS
@@ -0,0 +1,7 @@
+Bradley Grainger
+Khaled Hosny
+Kenichi Ishibashi
+Ryan Lortie
+Jeff Muizelaar
+suzuki toshiya
+Philip Withnall