code: function generateFont(done) {
  			var engine = require('./engines/' + o.engine);
  			engine(o, function(result) {
  				if (result === false) {
  					// Font was not created, exit
  					completeTask();
  					return;
  				}
  
  				if (result) {
  					o = _.extend(o, result);
  				}
  
  				done();
  			});
  		}
docs: Generate font using selected engine
  
  @param {Function} done