Feature #2: Implement Repair Provider

Logging Repair for Non-Warranty jobs has been brought into line with
Logging Warranty. RepairProviderFeature implemented which allows plugins
to be used in submitting jobs to third-parties for repair.

Disco.Data/Migrations/201407100413342_DBv15.cs

@@ -0,0 +1,18 @@
+namespace Disco.Data.Migrations
+{
+    using System;
+    using System.Data.Entity.Migrations;
+    
+    public partial class DBv15 : DbMigration
+    {
+        public override void Up()
+        {
+            AddColumn("dbo.DeviceModels", "DefaultRepairProvider", c => c.String(maxLength: 40));
+        }
+        
+        public override void Down()
+        {
+            DropColumn("dbo.DeviceModels", "DefaultRepairProvider");
+        }
+    }
+}