[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)

Which method of string_to_integer and integer_to_string do you prefer? I will remember and I will use it.

Just I use microsoft visual studio only and have no problems...