making this a wordpress-muplugin type

composer.json

 {
     "name": "lucha/r2db",
     "description": "r2db wordpress database",
-    "type": "wordpress-plugin",
+    "type": "wordpress-muplugin",
     "license": "MIT",
     "authors": [
         {
@@ -11,5 +11,8 @@
     ],    
     "require": {
         "flexihash/flexihash": "^2.0"
-    }    
+    },
+    "autoload":{
+        "files": ["db-hash.php", "db-backends.php"]
+    }
 }