src/text_section.js
function(process){
		var subSection = new TextSection();
		this.last().add({process: process, truthy: subSection});
		this.stack.push(subSection);
	}
function(process){
		var subSection = new TextSection();
		this.last().add({process: process, truthy: subSection});
		this.stack.push(subSection);
	}
Adds a subsection.