Rename name of admin permission to better convey its meaning
Rename data attribute: data-button-entity to data-embed-button
Declare class properties
Remove dead code
Fix travis failures based on suggestion by @berdir
Remove un-necessary explicit upcasting of config entity
Fix coding standards
Merge pull request #88 from cs-shadow/entity-embed-config-entity

Entity embed config entity
Add tests for EmbedButton CRUD
Add tests for administrative UI
Add missing access modifier