This commit attempts to fix https://github.com/go-sql-driver/mysql/issues/139 by
using an empty string ("") instead of the 0 byte []byte('0') when
formatting positive TIME fields.
Adding a test that checks for equality of TIME fields (#139).
Using %q instead of "%s" to make the extra byte visible, as suggested in https://github.com/go-sql-driver/mysql/pull/140#issuecomment-27236022
Renaming test to TestTimeSign(), removing extra 'TRUNCATE' statement and fixing the reference URL.
Merge pull request #140 from xiam/master

Fix TIME value sign byte