Now playing improvements

[declension]

• Rename handler method to now_playing, for consistency
• Support multiple artists by changing the LMS query to allow multi-valued tags (Fixes #90)
• But also support single-valued servers (this is configurable)
• Support composer in preference to artist but only for classical (Fixes #13)
• Allow FakeTransport to configure a fake status for testing
• Rename english_join to indicate it's multi-lingual(ish)
• Add tests around new scenarios
• Update local test to spit out more track details

[coveralls]

Pull Request Test Coverage Report for Build 152

• 36 of 39 (92.31%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 94.233%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
squeezealexa/utils.py	6	7	85.71%
squeezealexa/squeezebox/server.py	21	23	91.3%
<!--	Total:	36	39	92.31%	-->

Totals
Change from base Build 149:	-0.07%
Covered Lines:	964
Relevant Lines:	1023

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💛 - Coveralls