Split out C++ library

[mikemorris]

From @springmeyer:

It would be able to be installed into /usr/local/, for example, and would have a fontnik-config or a pkg-config entry so apps could find it.

So one somewhat missing piece is how gyp would be used. Currently gyp is largely used when C++ code is vendored into another code base but it should work both ways, you should be able to have a set of gyp files that both allow for:

• you to install a C++ lib into a given --prefix, and
• bundle/vendor it into a larger app and just point to its .gyp file

If you strip node-gyp out you lose things that can be quickly added back. I think the best way to do it is a Python configure/install wrapper. We basically need cpp-gyp, written in Python, that works on Windows/Mac/Linux, and is able to take args like --prefix, --debug, --enable-static, --enable-shared, etc. Python dependency is already there due to gyp being Python.

[springmeyer]

closing as per #80 (comment)