code: function(facts) {
          var ttl = '', fact,
              that = this;
          for (var i = 0; i < facts.length; i++) {
              fact = facts[i];
              ttl += that.factToTurtle(fact);
          }
          return ttl;
      }
docs: Transforms a set of facts into turtle.
  @param facts
  @returns {string}