Standalone function refactor

[GretaCB]

Per https://github.com/mapbox/node-cpp-skel/issues/10 and due to the ever-expanding uses-cases and complexity within the bench branch, there's a clear need to simplify the skel.

This PR is the start of refactoring the skel to allow for less interconnected code, making it easier to scale and to add new and separate implementations. Each new level of complexity can have its own .cpp and .hpp files within /src/your_code_here/, and pull them all together via module.cpp

That way, if you fork node-cpp_skel, we can document what you'd need to do:

• edit binding.gyp source array
• edit SetMethod
• delete any unneeded cpp/hpp files

Next

• [x] Decide what to do with class-based hello-world.cpp
  • Name it class-example?
  • Slim it down to a single async function?
  • Is there a need for a class example?
• [x] Document how to customize when adding new standalone functions
• [x] Incorporate NAN best practices per https://github.com/nodejs/nan/blob/master/doc/node_misc.md#api_nan_module_init?
  • we're all set for now, will do a future pass for NAN where necessary
• [x] Incorporate async-specific updates per https://github.com/nodejs/nan/blob/master/doc/asyncworker.md#api_nan_async_queue_worker?
  • Will implement this in the upcoming async examples

cc @springmeyer @mapsam

[codecov-io]

Codecov Report

Merging #44 into master will increase coverage by 0.04%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   98.82%   98.86%   +0.04%     
==========================================
  Files           2        4       +2     
  Lines          85       88       +3     
==========================================
+ Hits           84       87       +3     
  Misses          1        1

Impacted Files	Coverage Δ
src/hello_world.hpp	0% <ø> (ø)	:arrow_up:
src/hello_world.cpp	100% <ø> (ø)	:arrow_up:
src/module.cpp	100% <100%> (ø)
src/standalone/hello.cpp	100% <100%> (ø)

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[GretaCB]

Hey @springmeyer , just FYI, I integrated the HelloWorld class and re-added the original tests to retain them in master so that this merge is more of an addition than an entire sweep.

I noticed some funky behaviour in Travis that I'm curious about:

• Tests worked fine locally after a fresh distclean, and running console.log(module) returned:

  { hello: [Function: hello],
  HelloWorld: [Function: HelloWorld],
  version: '1.0.0' }

• Tests failed in Travis due to the hello function not being recognized, and running console.log(module) returned:

  { HelloWorld: [Function: HelloWorld], 
  version: '1.0.0' }

For some reason, the hello function is never added to the module. I removed ./src/hello_world.cpp from the build, so everything is working fine now, but curious why Travis was different.

[GretaCB]

Above ^^^ was due to being on node v0.10.x locally instead of node v4.