Pass datetime objects to sqlalchemy. Credit to Benjamin Wilson. Closes …

…#133.

csvkit/utilities/csvsql.py

@@ -56,7 +56,7 @@ def main(self):
                 insert = sql_table.insert()
                 headers = csv_table.headers()
 
-                for row in csv_table.to_rows(serialize_dates=True):
+                for row in csv_table.to_rows():
                     engine.execute(insert, [dict(zip(headers, row)), ])
 
         # Writing to file