Instantiate a new OAuth 2.0 client using
the client ID and client secret registered to your application.
Options:
| :site : | Specify a base URL for your OAuth 2.0 client.
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| :authorize_path : | Specify the path to the authorization endpoint.
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| :authorize_url : | Specify a full URL of the authorization endpoint.
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| :access_token_path : | Specify the path to the access token endpoint.
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| :access_token_url : | Specify the full URL of the access token endpoint.
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| :parse_json : | If true, application/json responses will be automatically parsed.
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