v4.1.0

• add oembed support for bcc instance of kaltura
• remove candela-citations as a dependency
  ** to install plugin separately using wp-cli wp plugin install https://github.com/lumenlearning/candela-citation/archive/v0.2.2.zip — plugin can be network activated, or left to be activated at the book level.
• adjust positioning of tabs in otb theme
• ensure compatibility with pb 5.3.3
• apply coding standards