Add a compareV2 static method for generating a diff of JsonNodes

[chrisbaldauf]

Intended to address #7. I'm happy to hear any feedback that you might have.

[coveralls]

Pull Request Test Coverage Report for Build 31

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 93.868%

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Totals
Change from base Build 29:	0.07%
Covered Lines:	597
Relevant Lines:	636

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💛 - Coveralls