Update singa-easy

[NLGithubWP]

Using the test deployment, at http://panda.d2.comp.nus.edu.sg:3001
predict requests needs to be updated

Using following code to test locally

predictor_host = "panda.d2.comp.nus.edu.sg:45617"
query_path = /data/train/IM-0164-0001.jpeg"
files = {'img': open(query_path, 'rb')}
res = requests.post('http://{}'.format(predictor_host), files=files)
print(res.text)
print(type(res.text))