Remove conservative deep copy, after discussion with @themiurgo

Author: Martin Journois

folium/features.py

@@ -204,7 +204,7 @@ def __init__(self, data, style_function=None):
         if 'read' in dir(data):
             self.data = json.load(data)
         elif type(data) is dict:
-            self.data = json.loads(json.dumps(data)) # A lazy way of doing deep copy.
+            self.data = data
         else:
             self.data = json.loads(data)