More ItemIds and conditional containers

I updated the way signs are read so that you can separate ids with commas. This allows for up to 16 3-digit ids on a single sign.

I also changed it so if you use a sorter that directly faces a container instead of the usual redirect, the item is placed in the container if it matches the sign.

This screenshot shows both new features.
![screenshot from 2013-05-18 16 46 04](https://f.cloud.github.com/assets/324999/523000/acab694a-c086-11e2-8cc2-69a315f8f2a0.png)