.travis.yml: Get back to fetching Cython wheels from PyPI.
Merge pull request #283 from pymssql/travis-Cython-wheels

.travis.yml: Get back to fetching Cython wheels from PyPI.
improved sqlalchemy test config handling
Set rowcount correctly after retrieving all rows through fetchall or fetchmany

ref #141
Added test created for PR #247

They use a different SQL query with no results.

They fail in the ``eq_(cur.rowcount, -1)`` assertions.