Allow tolerance to be passed to the render function

rendering/cases/single-layer/main.js

@@ -18,4 +18,4 @@ new Map({
   })
 });
 
-render('A single layer with a XZY source');
+render({message: 'A single layer with a XZY source'});

rendering/cases/text-style/main.js

@@ -120,4 +120,4 @@ new Map({
   })
 });
 
-render();
+render({tolerance: 0.05});