Updated OSX install instructions

[mandarvaze]

pip3 install -U jupyter installs the other dependencies like jsonschema, pyzmq, jinja2 etc. automatically I've successfully installed ijavascript on OSX (El Capitan) using these instructions.

[mandarvaze]

I had not read the CONTRIBUTING document before this PR, and thus I have did not create an issue (The change is minor) and have not updated AUTHORS file. Feel free to reject this PR, I will then make these changes, and reissue the PR.

[rgbkrk]

Good changes! I've been having people install one of the packages that includes zmq somehow, which would include pip install notebook.

I tend not to encourage people to use the pip3, relying on their default version of pip instead (some have python as python 3).

[mandarvaze]

pip install -U jupyter should also work, as mentioned on the jupyter read the docs page. But I have not used it myself, is all. I'm 99% sure "pip" (python2) version will also install the dependency automatically. Do you want me to send new PR, changing pip3 to pip ? (I will also create an issue, and update AUTHORs page, while I am at it.)

[rgbkrk]

Ah, cool.

If this was a repo I was maintaining, I'd just have you push a new commit changing the instruction. You can squash down to one commit if @n-riesco thinks otherwise.

[n-riesco]

@mandarvaze I agree with Kyle. I'd rather recommend pip.

And yes, please, I ask all the contributors to add their name to the AUTHORS file.

I wouldn't open another commit, I would simply:

git commit -a --amend
git push -f

But I don't really mind.

[mandarvaze]

Done. I have updated patch-1 branch with the following changes :

1. pip instead of pip3
2. Updated AUTHORS file

[n-riesco]

@mandarvaze Thank you!