Nan-style require() for including headers

@springmeyer

Let's take a cue from Nan and have a include_dirs.js file that allows compliers to use the following syntax when including libs and headers:

'<!(node -e \'require("hpp-skel")\')'

This is super helpful when we run into multiple versions of header files when things are installed with npm.

Next actions:

Document how to add new dependencies to the skel. Using include_dir trick is one thing to know for this.
Publish hpp-skel to npm and mason (header-only cpp libs should be published to npm if they're ever going to be used by a node module. If header-only cpp libs are going to be pulled into a pure C++ project, then publish with mason). Link to hpp-skel docs about publishing in cpp and node-cpp repos
Use hpp-skel as dependency in node-cpp-skel as part of include_dir

Our thinking has changed here, so no action is needed. I will recap:

Previously we packaged C++ header only libs in both mason and npm
Those npm packaged libs could be referenced in package.json, but it was hard to dynamically know their include paths for compiling against
The include_dirs.js trick was the solution.

However now we've moved away from packaging C++ libs in npm and only are targeting mason per mapbox/cpp#20 (comment).

So, any deps of node-cpp-skel or apps that use it will use mason for bringing in C++ headers. I've added an example of this in #43

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