Issue #515 completed, unit tests were added.Issue #538 completed.
Dismissed date had inproper format. Fixed.
Merge pull request #539 from nazariitashak/development

Issue #515 completed, unit tests were added.Issue #538 completed.
Issue #514 completed. Integration tests were added
Merge pull request #541 from nazariitashak/development

Issue #514 completed. Integration tests were added
Merge pull request #542 from EricpolUkraine/test

Release merge v1.15.5.0
Merge pull request #543 from EricpolUkraine/master

Release merge v1.15.5.0
Merge pull request #544 from AnnaStorozhenko/development

To issue #412
To issue #431 logic building mailing lists was replaced from controllers to helper