create gheb\data-migrations-bundle recipe

gheb/data-migrations-bundle/1.3/config/packages/data_migrations.yaml

@@ -0,0 +1,5 @@
+data_migrations:
+    dir_name: '%kernel.project_dir%/src/DataMigrations'
+    # namespace is arbitrary but should be different from App\Migrations
+    # as migrations classes should NOT be autoloaded
+    namespace: DataMigrations

gheb/data-migrations-bundle/1.3/manifest.json

@@ -0,0 +1,9 @@
+{
+    "bundles": {
+        "Gheb\\DataMigrationsBundle\\DataMigrationsBundle": ["all"]
+    },
+    "copy-from-recipe": {
+        "config/": "%CONFIG_DIR%/",
+        "src/": "%SRC_DIR%/"
+    }
+}