Merge pull request #479 from tawan0109/dev

Disabled LogFileAppender for CSharpWorker

csharp/Worker/Microsoft.Spark.CSharp/App.config

@@ -11,7 +11,9 @@
     <root>
       <level value="INFO" />
       <appender-ref ref="ConsoleAppender" />
+      <!--
       <appender-ref ref="LogFileAppender" />
+      -->
     </root>
     <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
       <layout type="log4net.Layout.PatternLayout">