Added Digg Support

Refactoring

src/main/java/org/scribe/builder/api/DiggApi.java

@@ -0,0 +1,26 @@
+
+package org.scribe.builder.api;
+
+import org.scribe.model.Token;
+
+public class DiggApi extends DefaultApi10a {
+
+  private static final String AUTHORIZATION_URL = "http://digg.com/oauth/authorize?oauth_token=%s";
+  private static final String BASE_URL = "http://services.digg.com/oauth/";
+
+  @Override
+  public String getRequestTokenEndpoint() {
+    return BASE_URL + "request_token";
+  }
+
+  @Override
+  public String getAccessTokenEndpoint() {
+    return BASE_URL + "access_token";
+  }
+
+  @Override
+  public String getAuthorizationUrl(Token requestToken) {
+    return String.format(AUTHORIZATION_URL, requestToken.getToken());
+  }
+
+}