Import cleanup

loopy/codegen/loop.py

-from __future__ import division
-from __future__ import absolute_import
-from six.moves import range
+from __future__ import division, absolute_import
 
 __copyright__ = "Copyright (C) 2012 Andreas Kloeckner"
 
@@ -24,6 +22,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 """
 
+from six.moves import range
 
 from loopy.diagnostic import warn, LoopyError
 from loopy.codegen import gen_code_block