add plugin for ECK entities

added 1 commit

• 30fff439 - handled case with the single bundle of ECK entity

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added 3 commits

• 30fff439...960a431b - 2 commits from branch project:2.0.x
• ed8f6121 - Merge branch '2.0.x' of git.drupal.org:project/views_add_button into views_add_button-3397877

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merged