code: function detect_doc(docs, customTags) {
      var ignore_tags = _.union(["param", "return", "author", "version", 
                                 "cancelable", "bubbles", "since", "inherits", "todo", "deprecated"], customTags);
      var doc_tags = _.filter(docs, function(tag) { return !_.include(ignore_tags, tag["tagname"]) && !subproperty(tag) });
      return _.compact(_.map(doc_tags, function(tag) { return tag["doc"] })).join(" ");
  }
docs: Combines "doc"-s of most tags Ignore tags that have doc comment themselves and subproperty tags