Reports - Code cleanup, Added user image to Activities log, Export update

MediaBrowser.Api/Reports/Model/ReportRow.cs

@@ -67,5 +67,9 @@ namespace MediaBrowser.Api.Reports
 		/// <summary> Gets or sets the type. </summary>
 		/// <value> The type. </value>
 		public ReportIncludeItemTypes RowType { get; set; }
+
+        /// <summary> Gets or sets the identifier of the user. </summary>
+        /// <value> The identifier of the user. </value>
+        public string UserId { get; set; }
 	}
 }