Added test for explicit port in OSCThreadServer.answer

[CJRChang]

Per discussion in https://github.com/kivy/oscpy/pull/8 I've tweaked OSCThreadServer.answer to test for specifying port in the response.

[coveralls]

Pull Request Test Coverage Report for Build 43

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.4%) to 99.258%

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Files with Coverage Reduction	New Missed Lines	%
oscpy/parser.py	1	98.96%
<!--	Total:	1		-->

Totals
Change from base Build 41:	0.4%
Covered Lines:	362
Relevant Lines:	364

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💛 - Coveralls

[CJRChang]

Thanks for the feedback - updated as requested.

[tshirtman]

Thank you!