Use clusters instead of breaks

Author: schnerd

README.md

@@ -3,14 +3,14 @@ D3 scale that clusters data into discrete groups
 
 ###Usage
 
-This scale largely has the same API as [d3.scaleQuantile](https://github.com/d3/d3-scale/blob/master/README.md#scaleQuantile) (however we use `breaks()` instead of `quantiles()`)
+This scale largely has the same API as [d3.scaleQuantile](https://github.com/d3/d3-scale/blob/master/README.md#scaleQuantile) (however we use `clusters()` instead of `quantiles()`)
 
 ```js
 var scale = d3.scaleCluster()
     .domain([1, 2, 4, 5, 12, 43, 52, 123, 234, 1244])
     .range(['#E5D6EA', '#C798D3', '#9E58AF', '#7F3391', '#581F66', '#30003A']);
 
-var breaks = scale.breaks(); // [12, 43, 123, 234, 1244]
+var clusters = scale.clusters(); // [12, 43, 123, 234, 1244]
 var color = scale(52); // '#9E58AF'
 var extent = scale.invertExtent('#9E58AF'); // [43, 123]
 ```

dist/d3-scale-cluster.min.js

@@ -9,13 +9,13 @@ describe('Scale', function () {
     scale = d3scaleCluster();
   });
 
-  it('should find natural breaks', function () {
+  it('should find clusters', function () {
     scale
       .domain(DEFAULT_DOMAIN)
       .range(DEFAULT_RANGE);
 
-    var breaks = scale.breaks();
-    expect(breaks).toEqual([12, 43, 123, 234, 1244]);
+    var clusters = scale.clusters();
+    expect(clusters).toEqual([12, 43, 123, 234, 1244]);
     expect(scale(52)).toEqual('c');
   });
 

spec/ScaleSpec.js

@@ -67,7 +67,7 @@ function d3scaleCluster () {
     return [extentA, extentB];
   };
 
-  scale.breaks = function () {
+  scale.clusters = function () {
     return breakpoints.slice(1);
   };