[WIP][CR]  Boats 

Add to game boats.

A while only inflatable boat (upd: *wooden* also available and can be crafted):

![excursion_3_inflatable_boat](https://cloud.githubusercontent.com/assets/6351438/3489118/f5901d24-0516-11e4-8aa2-95d226f22c8f.jpg)

You can fold/unfold it to carry in inventory and unpack near water. 

Engine - Paddles. It like pedals, but paddles.

Boats can swim by deep and shallow water. On the ground you can grab and drag the boat (or fold it to inventory).

You can fish from boat! Romantics!

![fish](https://cloud.githubusercontent.com/assets/6351438/3489136/2242b36c-0518-11e4-8970-1dcd376280f4.png)

is moored.

If it's out in the middle of the river, "anchored" might be a better term though that requires that you have an anchor of some kind and take a move or two to un/deploy the anchor when starting or parking.