Theorem organization system

[chewisinho]

Create a more organized - implement folder/subdirectory system so users can organize according to their needs

[pencels]

Possible solution:
We organize the directories such that going deeper into the file-system tree means going deeper into any given subject:

• ./Geometry/Objects/Point
• ./Geometry/Theorem/MidpointSplitting
  We then also have .js files that are the same name as the directory at the same height, and contain the modules in that directory as a bundle — much like the Geometry.js right now:

Geometry.js
-----------------------------------------------------------
module.exports = {
    Point: require("./Point"),
    LineSegment: require("./LineSegment"),
    Polygon: require("./Polygon"),
    Triangle: require("./Triangle"),
    Angle: require("./Angle")
};

This makes for simpler require() statements at the top of modules, as you'd only need to require('./Geometry') rather than everything that is in the Geometry directory.