Support Node 4.6 LTS

[lukeed]

• Simplify a few helper functions & if/elif expressions.

• Extract vNodeFlags definitions to own file for easier reading.

• Revert object destructuring ("re-structuring"? lol) for 4.6 support.

  • tested down to 4.2

• Closes #29

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Next?

• There are a few helper files that are never required.

• The attrsSvg file is also never used.

• Add tests

• Attach Travis (or similar)

[Havunen]

LGTM

[lukeed]

@Havunen Thanks! Thoughts on my next steps? Happy to go forward & take care of them.