More inventory interaction.

I think, we should have some sort of inventory sensors for turtle to tell, whether that inventory full or empty, or is there are any specified item in that inventory. For now if we want turtle to craft something, we should have a separate chest for each single material.
Also, AFAIK, thee are no way for now to detect, for example, does buildcraft engine has any fuel. You can try to suck it and test if it fails, yes, but it is not very accurate.

cc sensors checks stuff like that, heard it's abit buggy though so have not used it. + it's for 1.33

To look at inventories only, you could also try arp. It can also give you item names, ids and additional information. It's not updated yet, but I'm working on it. EDIT pr is out.

Also, you can craft with 16 different materials using only one chest.