convert Haystack JSON model

[jli113]

After downloading bravo.json, running the following lines:

import json
from brickschema import Graph
model = json.load(open("bravo.json"))
g = Graph(load_brick=True).from_haystack("http://project-haystack.org/bravo#", model)

File "C:\Users*\anaconda3\envs\Brick\lib\site-packages\brickschema\inference.py", line 711, in
entities = {e["id"].replace('"', ""): {"tags": e} for e in entities}

AttributeError: 'dict' object has no attribute 'replace'

[gtfierro]

Closing due to duplicate of #57 ; I'll respond there