Add unsplash oauth provider through composer, swap out for Provider

unsplash / unsplash-php

👻 Official PHP wrapper for the Unsplash API

MIT License

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Closed HughbertD closed 7 years ago

HughbertD commented 7 years ago

Using external implementation of phpleague/oauth2-client from here - unsplash in replacement of existing Provider
Interface should remain unchanged
Added a clear example of how to connect non-public accounts via this package under /examples/oauth-flow.php

I've added some PSR2 compliance here where possible, tidies docblocks and comments and removed unused vars