remove the adapter itself from the options passed so config via string works.

Author: jeacott1

src/Adapters/AdapterLoader.js

@@ -22,6 +22,9 @@ export function loadAdapter(adapter, defaultAdapter, options) {
     // If it's define as a module, get the default
     if (adapter.default) {
       adapter = adapter.default;
+    }
+	if(options.adapter) {
+      delete options.adapter;
     }
     return loadAdapter(adapter, undefined, options);
   } else if (adapter.module) {