Jhub-remote-login

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* Juan Cruz-Benito <juan.cruzibm.com> : Fixing auth_headers errors and adding minor improvements


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* Juan Cruz-Benito <juan.cruzibm.com> : Updating the repo to use as basis the https://github.com/rasmunk/jhub-authenticators. Merging code

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* Juan Cruz-Benito <juan.cruzibm.com> : Changing log in to use a header rather than an argument in the URL

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* Juan Cruz-Benito <juan.cruzibm.com> : Controlling incomplete URLs when login (without ?user=, i.e.)

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* Juan Cruz-Benito <juan.cruzibm.com> : Redirecting URL after log in to the user initial path

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* Juan Cruz-Benito <juan.cruzibm.com> : Renaming project & adding a method to log in from URL.

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