fix base64 string adapter encoding issue, issue Azure#193.

microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/core/utils/pipeline/Base64StringAdapter.java

@@ -2,15 +2,15 @@
  * Copyright Microsoft Corporation
  * 
  * Licensed under the Apache License, Version 2.0 (the "License");
- *  you may not use this file except in compliance with the License.
- *  You may obtain a copy of the License at
- *    http://www.apache.org/licenses/LICENSE-2.0
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
  * 
- *  Unless required by applicable law or agreed to in writing, software
- *  distributed under the License is distributed on an "AS IS" BASIS,
- *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  See the License for the specific language governing permissions and
- *  limitations under the License.
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 package com.microsoft.windowsazure.services.core.utils.pipeline;
 
@@ -25,7 +25,7 @@ public class Base64StringAdapter extends XmlAdapter<String, String> {
 
     @Override
     public String marshal(String arg0) throws Exception {
-        return new String(Base64.encode(arg0));
+        return new String(Base64.encode(arg0), "UTF-8");
     }
 
     @Override