Add Composer Compatability

[kopepasah]

Adds the ability to install this plugin via composer.

[psignoret]

Thanks for this pull request! Do you forsee any issues with the fact that I've taken firebase/php-jwt (under lib/php-jwt), prefixed the original namespace with "AADSSO/", but left it's original composer.json file in there?

[bradkovach]

wouldn't it need to be added as a dependency and then initialized with the autoloader?

…

On Thu, Nov 1, 2018 at 1:53 PM Philippe Signoret ***@***.***> wrote: Thanks for this pull request! Do you forsee any issues with the fact that I've taken firebase/php-jwt (under lib/php-jwt), prefixed the original namespace with "AADSSO/", but left it's original composer.json file in there? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#208 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AB8t2Yce-XGjYReiVa3YXr7-1F_M1PsTks5uq1FUgaJpZM4X1QZz> .

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[kopepasah]

This change would not impact how firebase/php-jwt is currently included. If you wanted to later include firebase/php-jwt as a Composer dependency, you would need to first require it (composer require firebase/php-jwt) and rework the application a bit to allow the autoloader to include those files.

As far as this change is concerned, it just allows installing this plugin as a Composer dependency (otherwise we have to create a fork, add our own composer.json and then require as a dependency - as I did here)

[kopepasah]

@psignoret was there any additional information you required?

[paulgibbs]

@psignoret Will you merge this PR please?