Added Sina Weibo Api and example.

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

@@ -0,0 +1,28 @@
+package org.scribe.builder.api;
+
+import org.scribe.model.*;
+
+public class SinaWeiboApi extends DefaultApi10a
+{
+	private static final String REQUEST_TOKEN_URL = "http://api.t.sina.com.cn/oauth/request_token";
+	private static final String ACCESS_TOKEN_URL = "http://api.t.sina.com.cn/oauth/access_token";
+	private static final String AUTHORIZE_URL = "http://api.t.sina.com.cn/oauth/authorize?oauth_token=%s";
+
+	@Override
+	public String getRequestTokenEndpoint()
+	{
+		return REQUEST_TOKEN_URL;
+	}
+
+	@Override
+	public String getAccessTokenEndpoint()
+	{
+		return ACCESS_TOKEN_URL;
+	}
+
+	@Override
+	public String getAuthorizationUrl(Token requestToken)
+	{
+		return String.format(AUTHORIZE_URL, requestToken.getToken());
+	}
+}