function Section(heading, customizable) {
  this.heading = heading.trim();
  this.id = this.heading.replace(/\s+/g, '-').toLowerCase();
  this.customizable = customizable;
  this.docstring = null;
  this.subsections = [];
}
Optional description for the following variable. You **can** use Markdown in descriptions to discuss `<html>` stuff.
  @foo: #fff;

  //-- This is a heading for a section whose variables shouldn't be customizable

  All other lines are ignored completely.