WARN: some sql warnings on the 3.5 builds
https://travis-ci.org/pydata/pandas/jobs/108942384

other warnings are already taken care of

```
...........................................S....................................S..........................S/home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'iris'
  result = self._query(query)
./home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'iris'
  result = self._query(query)
...S...S.../home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'test_frame_roundtrip'
  result = self._query(query)
./home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'test_frame1'
  result = self._query(query)
................................................................................S................................................................................S....................................S.........................S...................................................../home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'test'
  result = self._query(query)
../home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'test'
  result = self._query(query)
../home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'table_if_exists'
  result = self._query(query)
..../home/travis/miniconda/envs/pandas/lib/python3.5/site-packages/pymysql/cursors.py:146: Warning: Unknown table 'test_table'
  result = self._query(query)
```
