Merge pull request #22 from yefim/patch-1

Clear up the README

README.md

@@ -51,10 +51,10 @@ the user is responsible for rendering the diagram.
 
 Roughly:
 
-```
+``` javascript
 var voronoi = new Voronoi();
-var bbox = {xl:0,xr:800,yt:0,yb:600};
-var sites = [{x:200, y:200}, {x:50, y:250}, {x:400, y:100} /* , ... */];
+var bbox = {xl: 0, xr: 800, yt: 0, yb: 600}; // xl is x-left, xr is x-right, yt is y-top, and yb is y-bottom
+var sites = [ {x: 200, y: 200}, {x: 50, y: 250}, {x: 400, y: 100} /* , ... */ ];
 
 // a 'vertex' is an object exhibiting 'x' and 'y' properties. The
 // Voronoi object will add a unique 'voronoiId' property to all
@@ -103,7 +103,7 @@ Added on October 12, 2013: In order to help improve performance,
 `Voronoi.recycle()` has been added to allow the recycling of a returned Voronoi
 diagram. Usage:
 
-```
+``` javascript
 var diagram;
 ...