[Documentation] Document usage of <select>

[vjeux]

@leifdenby came to IRC as he couldn't get <select><options>...</select> working. It wasn't clear to me that we should use value={...} on the <select> itself rather than selected={...} on <option>s. We need to make the doc clearer here.

Here's a JSFiddle that gives 3 examples: Controlled, Controller with LinkState and Uncontrolled <select>

http://jsfiddle.net/5734W/

[chenglou]

Is this format used because it's easier to work with in React, or is there some other reason?
Also, I could take on this. Without mentioning LinkState right?
Should this also be mentioned in DOM Inconsistencies?

[plievone]

Fixed in #581 ?