Convert test_contains, test_crypt, and test_select to unittest.

Patch from GHOP 294 by David Marek.
diff --git a/Misc/ACKS b/Misc/ACKS
index 43bbb90..c2cad5c 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -428,6 +428,7 @@
 Grzegorz Makarewicz
 Ken Manheimer
 Vladimir Marangozov
+David Marek
 Doug Marien
 Alex Martelli
 Anthony Martin