Added migrations

EventArguments/MigrationProgressEventArgs.cs

@@ -0,0 +1,23 @@
+using System;
+
+namespace DbTools.EventArguments {
+    public delegate void MigrationProgressEventHandler(object sender, MigrationProgressEventArgs e);
+
+    public class MigrationProgressEventArgs : EventArgs {
+        public string StatusText { get; set; }
+        public int Total { get; set; }
+        public int Pending { get; set; }
+        public int Successful { get; set; }
+        public int Failed { get; set; }
+
+        public MigrationProgressEventArgs() { }
+
+        public MigrationProgressEventArgs(int total, int pending, int successful, int failed, string statusText = "") {
+            Total = total;
+            Pending = pending;
+            Successful = successful;
+            Failed = failed;
+            StatusText = statusText;
+        }
+    }
+}