Added migrations

EventArguments/MigrationCompletedEventArgs.cs

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+using System;
+
+namespace DbTools.EventArguments {
+    public delegate void MigrationCompletedEventHandler(object sender, MigrationCompletedEventArgs e);
+
+    public class MigrationCompletedEventArgs : EventArgs {
+        public string MigrationName { get; set; }
+        public bool WasSuccessful { get; set; }
+        public Exception Error { get; set; }
+        public int Remaining { get; set; }
+
+        public MigrationCompletedEventArgs() { }
+        public MigrationCompletedEventArgs(string migrationName, int remaining, Exception error = null, bool wasSuccessful = true) {
+            MigrationName = migrationName;
+            WasSuccessful = error != null ? false : wasSuccessful;
+            Error = error;
+            Remaining = remaining;
+        }
+    }
+}

EventArguments/MigrationProgressEventArgs.cs

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+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;
+        }
+    }
+}

EventArguments/MigrationStartedEventArgs.cs

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+using System;
+
+namespace DbTools.EventArguments {
+    public delegate void MigrationStartedEventHandler(object sender, MigrationStartedEventArgs e);
+
+    public class MigrationStartedEventArgs : EventArgs {
+        public string MigrationName { get; set; }
+        public int Remaining { get; set; }
+
+        public MigrationStartedEventArgs() { }
+        public MigrationStartedEventArgs(string migrationName, int remaining) {
+            MigrationName = migrationName;
+            Remaining = remaining;
+        }
+    }
+}