Merge pull request #862 from michaelgmiller/master

Add support for tickPadding, tickValues, and round

d3/d3.d.ts

@@ -505,6 +505,8 @@ declare module D3 {
             flush(): void;
         }
         transition(): Transition.Transition;
+
+        round(x: number, n: number): number;
     }
 
     export interface Dispatch {
@@ -1555,6 +1557,16 @@ declare module D3 {
                 (...arguments: any[]): Axis;
             };
 
+            tickPadding: {
+                (): number;
+                (padding: number): Axis;
+            };
+
+            tickValues: {
+                (): any[];
+                (values: any[]): Axis;
+            };
+
             tickSubdivide(count: number): Axis;
             tickSize(major?: number, minor?: number, end?: number): Axis;
             tickFormat(formatter: (value: any) => string): Axis;