2.0.0-alpha3

• As CPS pagination got supported in the Management API for listing API products and Companies we also added it to API client.
• getEntities() and getEntityIds() load all entities and entity ids
  from Apigee Edge by default, even if it requires multiple API calls
  because of CPS pagination.
• Classes and interfaces related to CPS and non CPS entity listing got renamed:
  • CpsLimitEntityController => PaginatedEntityController
  • CpsLimitEntityControllerInterface => PaginatedEntityControllerInterface
  • CpsLimitEntityController => PaginatedEntityController
  • CpsListingEntityControllerInterface => PaginatedEntityListingControllerInterface
  • CpsListingEntityControllerTrait => PaginatedEntityListingControllerTrait
  • NonCpsListingEntityControllerTrait => NoPaginationEntityListingControllerTrait
  • NonCpsListingEntityControllerInterface => NonPaginatedEntityListingControllerInterface
  • CpsListLimitInterface => PagerInterface
• OAuth: Fixed re-authentication with client credentials if refresh token has expired.
• Changed return types in AppCredentialController as it does not inherit from EntityCrudOperationsControllerTrait anymore.
• Constants that represents constant state of the Management API now defined in interfaces instead of classes.
• Also the visibility of some constants changed to public from private or protected.
• Added support to add Retry plugin configuration to the client.
• Renamed environment variables used in tests for authentication from APIGEE_EDGE_PHP_SDK_* to APIGEE_EDGE_PHP_CLIENT_*.
• Improved test coverage.
• Better configuration in .gitattributes to exclude more unnecessary files from prefer-dist install.