Novice module can open images from a url: Pull request

[Neeraj Gangwar]

Hi,

I created a pull request just now. Link to the pull request is here<https://github.com/scikit-image/scikit-image/pull/916>. 
Please review the code.

Changes:

   1. Use a regex to check if the given path is a url.
   2. In the case of url, fetch the image file from the link.
   3. Otherwise check if file exists on the system and fetch.


Neeraj
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