add api() method to service builder

changelog.txt

@@ -24,3 +24,8 @@
   * FEATURE: OAuth 2.0 Support and Facebook support out of the box (thanks Diego Silveira)
   * REFACTOR: Api creation and OAuthService refactors
   * REFACTOR: Connections are created lazily (just before sending the request)
+
+[1.1.1]
+
+  * FIX: Removed isEmpty() from OAuth2.0 code in order to support older JVMs
+  * FEATURE: Overloaded provider() method to support instances as well as classes (thanks dustismo)

src/main/java/org/scribe/builder/ServiceBuilder.java

@@ -56,6 +56,21 @@ public class ServiceBuilder
     return api;
   }
 
+  /**
+   * Configures the {@link Api}
+   *
+   * Overloaded version. Let's you use an instance instead of a class.
+   *
+   * @param api instance of {@link Api}s
+   * @return the {@link ServiceBuilder} instance for method chaining
+   */
+  public ServiceBuilder provider(Api api)
+  {
+	  Preconditions.checkNotNull(api, "Api cannot be null");
+	  this.api = api;
+	  return this;
+  }
+
   /**
    * Adds an OAuth callback url
    *