Integrate migrations with drone.

Also add migration to tests.

pkg/database/testing/testing.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/drone/drone/pkg/database"
 	"github.com/drone/drone/pkg/database/encrypt"
+	"github.com/drone/drone/pkg/database/migrate"
 	. "github.com/drone/drone/pkg/model"
 
 	_ "github.com/mattn/go-sqlite3"
@@ -31,6 +32,7 @@ func init() {
 
 	// notify meddler that we are working with sqlite
 	meddler.Default = meddler.SQLite
+	migrate.Driver = migrate.SQLite
 }
 
 func Setup() {
@@ -40,6 +42,9 @@ func Setup() {
 	// make sure all the tables and indexes are created
 	database.Set(db)
 
+	migration := migrate.New(db)
+	migration.All().Migrate()
+
 	// create dummy user data
 	user1 := User{
 		Password: "$2a$10$b8d63QsTL38vx7lj0HEHfOdbu1PCAg6Gfca74UavkXooIBx9YxopS",