chore(material): add e2e smoke tests for a few more components.

Closes #1884

modules/angular2_material/src/components/radio/radio-button.scss

@@ -16,7 +16,7 @@ md-radio-button {
 
 md-radio-group {
   border: 1px dotted transparent;
-  display: block;
+  display: inline-block;
   outline: none;
 }
 
@@ -71,6 +71,11 @@ md-radio-group {
   width: auto;
 }
 
+.md-radio-root {
+  display: block;
+  cursor: pointer;
+}
+
 
 // THEME
 

modules/angular2_material/src/components/radio/radio_button.html

@@ -2,9 +2,9 @@
 
 <!-- TODO(jelbourn): render the radio on either side of the content -->
 
-<label role="radio"
+<label role="radio" class="md-radio-root"
     [class.md-radio-checked]="checked"
-    (^click)="select($event)" >
+    (^click)="select($event)">
   <!-- The actual `radio` part of the control. -->
   <div class="md-radio-container">
     <div class="md-radio-off"></div>