FIX #50 - Invalid JSON has misleading message (even if msg should be ignored)

[aricart]

When receiving invalid JSON payloads, the client was presented with a partial message that associated the subject of the subscription rather than the collected (and potentially invalid message). Changed so that the invalid message is included - the invalid message will have the correct subject the parsed from the protocol line, etc).

Also updated tests showing that error must be checked.

[coveralls]

Pull Request Test Coverage Report for Build 164

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 87.744%

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Totals
Change from base Build 161:	0.3%
Covered Lines:	810
Relevant Lines:	916

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💛 - Coveralls