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Enable dynamic parameters being passed into the authorization URL

As per - https://github.com/thephpleague/oauth2-client/pull/485 - adding tests to handle custom authorization URL parameters.

When for example using Azure AD, you may need to pass additional parameters to the authorization URL - like `prompt`. This change enables passing custom parameters to the authorization URL as per each provider's needs. More options for Azure AD can be found [here](https://msdn.microsoft.com/en-us/library/azure/dn645542.aspx)
For Google those are for example access_type or login hint - found [here](https://developers.google.com/youtube/v3/guides/auth/server-side-web-apps)

Add Eve Online provider

Fix resource_owner_id being put into the wrong array

Include resource owner id in access token json

Fixes #472

Add tests for array accessor trait, fixed one bug

Excluded .scrutinizer.yml in .gitattributes

Add Shotbow as a provider

Add Mollie provider

Scrutinizer Auto-Fixes

This commit consists of patches automatically generated for this project on https://scrutinizer-ci.com

Use expires to serialize access tokens

Resolves: #458
See also: #375

Inserting PHPDoc missing

Add Salesforce provider to readme

Add ArrayAccessorTrait

Add Foursquare provider to readme

Added Stripe provider

Update travis config to skip gh-pages branch

Add PayPal provider to list of third-party providers

Yahoo OAuth Provider is added