added `nkeyCreds` option that automatically generates a nonceSigner for nkey authentication

[aricart]

[CHANGE] simplified examples [ADD] Added tsnats-rply [FIX] fixed a bug where if a permissionsError was notified, processInbound returned.

[coveralls]

Pull Request Test Coverage Report for Build 114

• 10 of 25 (40.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.01%) to 88.769%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/protocolhandler.ts	8	23	34.78%
<!--	Total:	10	25	40.0%	-->

Totals
Change from base Build 112:	-1.01%
Covered Lines:	919
Relevant Lines:	1027

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💛 - Coveralls