Use const/let now we use node 4.2

server/controllers/api/v1/index.js

server/controllers/api/v1/pods.js

server/controllers/api/v1/remoteVideos.js

server/controllers/api/v1/videos.js

server/controllers/index.js

server/helpers/customValidators.js

server/helpers/logger.js

server/helpers/peertubeCrypto.js

server/helpers/requests.js

server/helpers/utils.js

server/initializers/checker.js

server/initializers/constants.js

server/initializers/database.js

server/lib/friends.js

server/lib/poolRequests.js

server/lib/videos.js

server/lib/webtorrent.js

server/lib/webtorrentProcess.js

server/middlewares/cache.js

server/middlewares/index.js