Allow setting of styles/properties via objects.

Additionally:
 1. Make the type for setting attributes via objects slightly stricter.
 2. Add tests for style/property setting via object maps.

d3/d3-tests.ts

@@ -2286,6 +2286,21 @@ function attrObjTest () {
         .attr({"xlink:href": function(d, i) { return d + "-" + i + ".png"; }});
 }
 
+// Test for setting styles as an object
+// From https://github.com/mbostock/d3/blob/master/test/selection/style-test.js
+function styleObjTest () {
+    d3.select('body')
+        .style({"background-color": "white", opacity: .42});
+}
+
+// Test for setting styles as an object
+// From https://github.com/mbostock/d3/blob/master/test/selection/property-test.js
+function propertyObjTest () {
+    d3.select('body')
+        .property({bgcolor: "purple", opacity: .41});
+}
+
+
 // Test for brushes
 // This triggers a bug (shown below) in the 0.9.0 compiler, but works with
 // 0.9.1 compiler.

d3/d3.d.ts

@@ -710,7 +710,7 @@ declare module D3 {
             (name: string): string;
             (name: string, value: any): Selection;
             (name: string, valueFunction: (data: any, index: number) => any): Selection;
-            (attrValueMap : any): Selection;
+            (attrValueMap : Object): Selection;
         };
 
         classed: {
@@ -723,12 +723,14 @@ declare module D3 {
             (name: string): string;
             (name: string, value: any, priority?: string): Selection;
             (name: string, valueFunction: (data: any, index: number) => any, priority?: string): Selection;
+            (styleValueMap : Object): Selection;
         };
 
         property: {
             (name: string): void;
             (name: string, value: any): Selection;
             (name: string, valueFunction: (data: any, index: number) => any): Selection;
+            (propertyValueMap : Object): Selection;
         };
 
         text: {