feat(radio): Allow inline property

Add the option to make a radio field inline. (#96)
* Update radio.js

* Update radio.html

Author: adamduren

src/types/radio.html

@@ -1,5 +1,5 @@
 <div class="radio-group">
-  <div ng-repeat="(key, option) in to.options" class="radio">
+  <div ng-repeat="(key, option) in to.options" ng-class="{ 'radio': !to.inline, 'radio-inline': to.inline }">
     <label>
       <input type="radio"
              id="{{id + '_'+ $index}}"

src/types/radio.js

@@ -13,7 +13,8 @@ export default ngModule => {
         templateOptions: {
           options: check.arrayOf(check.object),
           labelProp: check.string.optional,
-          valueProp: check.string.optional
+          valueProp: check.string.optional,
+          inline: check.bool.optional,
         }
       })
     });