Fix imports

Author: drew-gross

src/index.js

@@ -1,7 +1,7 @@
-import ParseServer            from './ParseServer'
-import { FileSystemAdapter } from './Adapters/Files/FileSystemAdapter';
-import { GCSAdapter }        from './Adapters/Files/GCSAdapter';
-import { S3Adapter }         from './Adapters/Files/S3Adapter';
+import ParseServer           from './ParseServer';
+import { GCSAdapter }        from 'parse-server-gcs-adapter';
+import { S3Adapter }         from 'parse-server-s3-adapter';
+import { FileSystemAdapter } from 'parse-server-fs-adapter';
 
 // Factory function
 let _ParseServer = function(options) {