Merge recent bugfixes and updates into the master

[coveralls]

Pull Request Test Coverage Report for Build 702

• 112 of 114 (98.25%) changed or added relevant lines in 5 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.01%) to 99.811%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
music_publisher/models.py	11	13	84.62%
<!--	Total:	112	114	98.25%	-->

Files with Coverage Reduction	New Missed Lines	%
music_publisher/base.py	1	99.58%
<!--	Total:	1		-->

Totals
Change from base Build 683:	0.01%
Covered Lines:	1582
Relevant Lines:	1585

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💛 - Coveralls