Cycles / GPU Image Textures:

* On nvidia Kepler GPUs (sm_30 and above), there are now 145 byte images available, instead of 95. 
We could extend this to about 200 if needed. 

Could not test this, as I don't have a Kepler GPU, so feedback on this would be appreciated.

Thanks to Brecht for review and some fixes. :)

intern/cycles/device/device_cpu.cpp

@@ -340,6 +340,7 @@ void device_cpu_info(vector<DeviceInfo>& devices)
 	info.description = system_cpu_brand_string();
 	info.id = "CPU";
 	info.num = 0;
+	info.extended_images = true;
 	info.advanced_shading = true;
 	info.pack_images = false;