Add automatic access token refreshment when expired

[jzheng2017]

Is your feature request related to a problem? Please describe.
Currently when the access token expires the API can no longer make any request to the Spotify Web API. There is no system in place that detects whether the access token has expired and refreshes the token when necessary.

The feature request is to implement a system that will refresh the access token automatically when expired using the already existing AuthorizationRefreshToken.

Describe the solution you'd like
The system should be able to detect when the token has expired. When it has detected that the token has expired it will make a request to Spotify Authorization API for a new access token. When the new access token has been obtained it should update all services that use that token to make requests.

Describe alternatives you've considered
None at the moment.

Additional context
This feature should be implemented in SpotifyApi, or somewhere else if it is more fitting but should be well substantiated why it is done that way.

[razorahul]

Attempting issue #1

[jzheng2017]

Attempting issue #1

Any update on the progress of this issue?

[razorahul]

@jzheng2017 Will update in next 2 days.

[jzheng2017]

@jzheng2017 Will update in next 2 days.

I will remove you as assignee for now. If you have more update on the progress I will reassign you.