[CR] eat from ground

Portion of Items from smashed vending machine:

![1](https://cloud.githubusercontent.com/assets/6351438/3555098/82775fae-0913-11e4-9cc2-70753551b5a6.png)

Press `[E]`, press `Esc`:
All items from vending machine (doubles excluded):
![2](https://cloud.githubusercontent.com/assets/6351438/3555105/9f8b7288-0913-11e4-9133-eae04549e52f.png)


This needs to be a keybinding other than 'quit'.  Forcing the player to cancel out of both menus any time they trigger the eat menu and change their mind isn't ok.  that means extending the inventory menu interface a bit, which will be kind of a pain, but I'll see what I can find.
Also I need you to start using the project coding style defined in doc/CODING_STYLE.md.