Move vendor libraries to /vendors folder and exclude from LGTM

lgtm.yml

src/node/utils/tar.json

src/package.json

src/static/js/AttributeManager.js

src/static/js/ace2_inner.js

src/static/js/broadcast.js

src/static/js/broadcast_slider.js

src/static/js/collab_client.js

src/static/js/domline.js

src/static/js/pad.js

src/static/js/pad_editbar.js

src/static/js/rjquery.js

src/static/js/skiplist.js

src/static/js/timeslider.js

src/static/js/undomodule.js

src/static/js/vendors/browser.js

src/static/js/vendors/farbtastic.js

src/static/js/vendors/gritter.js

src/static/js/vendors/html10n.js

src/static/js/vendors/jquery.js