Fix batch parse failure message to give clear description of what failed (#566)

Author: kevcunnane

src/Microsoft.SqlTools.ServiceLayer/BatchParser/BatchParserWrapper.cs

@@ -8,6 +8,7 @@
 using System.Collections.Generic;
 using System.IO;
 using Microsoft.SqlTools.ServiceLayer.BatchParser.ExecutionEngineCode;
+using System.Globalization;
 
 namespace Microsoft.SqlTools.ServiceLayer.BatchParser
 {
@@ -347,7 +348,8 @@ private void OnBatchParserExecutionError(object sender, BatchParserExecutionErro
             {
 
                 Logger.Write(LogLevel.Verbose, SR.BatchParserWrapperExecutionError);
-                throw new Exception(SR.BatchParserWrapperExecutionEngineError);
+                throw new Exception(string.Format(CultureInfo.CurrentCulture,
+                    SR.BatchParserWrapperExecutionEngineError, args.Message + Environment.NewLine + '\t' + args.Description));
 
             }
         }