[doc_comment plugin] Support @class and @constructor
[doc_comment plugin] Support @class and @constructor

Issue #678

emacsmirror/tern,emacsmirror/tern,emacsmirror/tern,marijnh/tern,MarcelGerber/tern,MarcelGerber/tern,albertinad/tern,neoclide/tern,ternjs/tern,ternjs/tern,albertinad/tern,albertinad/tern,neoclide/tern,MarcelGerber/tern,othree/tern,ternjs/tern,othree/tern,neoclide/tern,marijnh/tern,fileability/tern,marijnh/tern,fileability/tern,othree/tern,fileability/tern