Bugfix for non int Shotgun framerange data

Hi guys,

The Shotgun field we are using here for frameIn/frameOut is of type 'text' and was  causing the setFrameRange call to fail with the following error:

> Traceback (most recent call last):
   File "/rdo/rodeo/repositories/tank/studio/install/apps/app_store/tk-multi-setframerange/v0.1.7/app.py", line 57, in run_app
     message += "New start frame: %d\n\n" % new_in
 TypeError: int argument required

I added a cast for the new_in/new_out in the message to get rid of it.

I also added 2 lines to set the framerange in the Softimage render options.

Cheers
Julien