Encode VAPID key in URL-safe base64 (web-push-libs#220)

*  fix base64encode issue

*  typo ~ fix Base64Url::encode

*  fix phpunit testing

*  fix The condition becomes ">=86" and ">=42"

Remove var_dump from Utils (web-push-libs#219)

Improve PHPDoc

Remove replacing fcm/send for aes128gcm (web-push-libs#214)

Close web-push-libs#201

Use Google repo for testing service (web-push-libs#215)

Allow client subscription structure to be directly passed to create (w…

…eb-push-libs#191)

this addresses web-push-libs#179

Return results as a \Generator (web-push-libs#185)

* WIP: initial concept of returning report objects

* WIP: add a test

* Docs update

Change results handling example

* Attempt to fix tests web-push-libs#1

* Change flush() signature for easier mocking

* Unqualify iterable

* Remove ignored vagrant file

Fix Subscription::create when not giving every keys (web-push-libs#163)

add reasonPhrase (web-push-libs#157)

Add support for aes128gcm encoding (web-push-libs#150)

Fixes web-push-libs#48 web-push-libs#136

* Introduce Subscription object

* Fix CI

* Add content encoding field

* Actually prevent using a non supported content encoding

* Add PHPDoc tag

* Add content encoding to VAPID

* Add aes128gcm content encoding to VAPID

* Only send Encryption and Crypto-Key headers in aesgcm

* Add encryption logic of aes128gcm

* Add aes128gcm to supported content encodings

* Add encryptionContentCodingHeader

* Add test for every supported content encodings

* Use latest version of web-push-testing-service

* Fix test when browser doesn't have PushManager.supportedContentEncodings

* Fix pack ?

* Replace fcm/send by wp for FCM urls

* Add support for no padding in aes128gcm

* Fix record size for aes128gcm

* Fix padding with aes128gcm

* Update README