Returns string representation of current node
@return {String}
function() {
			var utils = require('utils');
			
			var start = this.start;
			var end = this.end;
			var content = this.content;
			
			// apply output processors
			var node = this;
			_.each(outputProcessors, function(fn) {
				start = fn(start, node, 'start');
				content = fn(content, node, 'content');
				end = fn(end, node, 'end');
			});
			
			
			var innerContent = _.map(this.children, function(child) {
				return child.toString();
			}).join('');
			
			content = require('abbreviationUtils').insertChildContent(content, innerContent, {
				keepVariable: false
			});
			
			return start + utils.padString(content, this.padding) + end;
		}