Modernize build2

[springmeyer]

Combo of #5 and #6.

@ghoshkaj and @chaupow - This brings in your working changes + node-cpp-skel best practices and tools. Per voice, in the future node-cpp-skel will provide cmake based build, but for now this is using gyp. I propose merging this to master, then working from this as a base.

[springmeyer]

Rebased this branch against congestion-cpp-hashmap. New plan is to merge this into congestion-cpp-hashmap and #6 into master. This will get master testing on travis without congestion related changes. And get the congestion work benefitting from the build modernization.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (congestion-cpp-hashmap@cc9134b). Click here to learn what that means.
The diff coverage is 0%.

@@                    Coverage Diff                    @@
##             congestion-cpp-hashmap       #7   +/-   ##
=========================================================
  Coverage                          ?   60.92%           
=========================================================
  Files                             ?        7           
  Lines                             ?      325           
  Branches                          ?        0           
=========================================================
  Hits                              ?      198           
  Misses                            ?      127           
  Partials                          ?        0

Impacted Files	Coverage Δ
src/nodejs_bindings.cpp	46.37% <0%> (ø)

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[springmeyer]

Closing. This work is now over at #8