Configure message buffer (#82)

[mehaase]

Add arguments for configuring message queue size and maximum message size.

The closing code is needlessly complex and made the message size code very difficult to write, so I opened up #90 to refactor the way that closing is handled.

The only other thing that stands out to me is that the connection APIs have a lot of repeated arguments now. I know I could use **kwargs to make this more DRY, but then I think (?) that the docs would show kwargs instead of the actual argument names, and that doesn't seem very user-friendly. Thoughts?

[coveralls]

Pull Request Test Coverage Report for Build 103

• 28 of 28 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 92.822%

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Files with Coverage Reduction	New Missed Lines	%
trio_websocket/_impl.py	1	93.03%

Totals
Change from base Build 97:	0.3%
Covered Lines:	375
Relevant Lines:	404

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💛 - Coveralls

[mehaase]

Umm, not sure how this got closed. Obviously I intended to merge it!

[mehaase]

Merged directly into master.