Fixed problem with seen query using unescaped nicknames. Not sure

why this is necessary though (see issue #29).
Removed import of datetime since it's no longer used (closes #26).
All unit tests pass again.

DbAccess.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-import time, sys, os, datetime, string
+import time, sys, os, string
 import MySQLdb
 
 class Seen:
@@ -104,7 +104,7 @@ def close(self):
 
     def seen(self, nick):
         nick = string.replace(nick,"*","%")
-        return self.executeAndFetchAll("SELECT * FROM seen WHERE name LIKE %s ORDER BY timestamp DESC LIMIT 3", nick)
+        return self.executeAndFetchAll("SELECT * FROM seen WHERE name LIKE %s ORDER BY timestamp DESC LIMIT 3", MySQLdb.escape_string(nick))
 
     def updateSeen(self, nick, channel, message):
         rows = self.executeAndFetchAll("SELECT id FROM seen WHERE name = %s", nick)