Support auto convertion of timestamp/date datatypes in sqlite to date…

…time.data objects. Closes webpy#22.

The datetime datatype is still converted to a string. The sqlite3 python driver only supports timestamp datatype.

web/db.py

@@ -962,6 +962,10 @@ def __init__(self, **keywords):
 
         if db.__name__ in ["sqlite3", "pysqlite2.dbapi2"]:
             db.paramstyle = 'qmark'
+
+        # sqlite driver doesn't create datatime objects for timestamp columns unless `detect_types` option is passed.
+        # It seems to be supported in sqlite3 and pysqlite2 drivers, not surte about sqlite.
+        keywords.setdefault('detect_types', db.PARSE_DECLTYPES)
 
         self.paramstyle = db.paramstyle
         keywords['database'] = keywords.pop('db')