Specify properties in pub command

[jandelgado]

Adds a new option --property KEY=VALUE to the pub command to specify message properties.

[coveralls]

Pull Request Test Coverage Report for Build 10709086572

Details

• 85 of 145 (58.62%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.5%) to 87.516%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmd/rabtap/main.go	3	5	60.0%
cmd/rabtap/message_transformer.go	7	9	77.78%
cmd/rabtap/command_line_parse_props.go	43	54	79.63%
cmd/rabtap/message.go	17	39	43.59%
cmd/rabtap/command_line.go	11	34	32.35%

Totals
Change from base Build 10596423181:	-1.5%
Covered Lines:	2678
Relevant Lines:	3060

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💛 - Coveralls