- test py36

- Current mysqlclient does not accept "bytes" on py3k, SQLAlchemy 0.9
still lists this client (the original mysqldb version) as
"supports_unicode_statements=False" so is no longer functional on py3k.
- Rollback transaction after table drop; it seems py3.6 sqlite3
suddenly turned on transactional DDL for SQLite

Change-Id: Ic3b7881583bde5602e54811cf6a149761038b9fd

tests/test_version_table.py

@@ -35,8 +35,8 @@ class TestMigrationContext(TestBase):
         self.transaction = self.connection.begin()
 
     def tearDown(self):
-        version_table.drop(self.connection, checkfirst=True)
         self.transaction.rollback()
+        version_table.drop(self.connection, checkfirst=True)
         self.connection.close()
 
     def make_one(self, **kwargs):

tox.ini

@@ -1,6 +1,9 @@
 [tox]
 minversion=1.8.dev1
-envlist = py{27,33,34,35}-sqla{09,10,11}, py{27}-sqla{079,084}
+
+# current mysqlclient fails with <=SQLA 0.9 on py3k due to 
+# old unicode statements flag
+envlist = py{27,33,34,35,36}-sqla{10,11}, py{27}-sqla{079,084,09}
 
 SQLA_REPO = {env:SQLA_REPO:git+http://git.sqlalchemy.org/sqlalchemy.git}