make write_workflow_resources python 2 compatible (take 2)

Author: oesteban

nipype/pipeline/engine/utils.py

@@ -1336,7 +1336,7 @@ def write_workflow_resources(graph, filename=None):
             big_dict['params'] += [params] * nsamples
 
     with open(filename, 'wt') as rsf:
-        json.dump(big_dict, rsf)
+        json.dump(big_dict, rsf, ensure_ascii=False)
 
     return filename