Support for custom data includes in transformer

Fix dingo#1575 
This is a resubmission of the pull request with proper formatting

Author: gazben

src/Transformer/Adapter/Fractal.php

@@ -197,6 +197,10 @@ protected function mergeEagerLoads($transformer, $requestedIncludes)
         foreach ($includes as $key => $value) {
             $eagerLoads[] = is_string($key) ? $key : $value;
         }
+        
+        if (property_exists($transformer, 'lazyLoadedIncludes')) {
+            $eagerLoads = array_diff($eagerLoads, $transformer->lazyLoadedIncludes);
+        }
 
         return $eagerLoads;
     }