> ws@0.4.12 preinstall /tmp/build_f683313bc695999479a087d6a4181586/node_modules/socket.io/node_modules/socket.io-client/node_modules/ws
remote:        > make
remote:
remote:        node-waf configure build
remote:        make: node-waf: Command not found
remote:        make: *** [all] Error 127
remote:
remote:        npm ERR! Linux 3.13.0-61-generic
remote:        npm ERR! argv "node" "/tmp/build_f683313bc695999479a087d6a4181586/.heroku/node/bin/npm" "rebuild"
remote:        npm ERR! node v0.12.7
remote:        npm ERR! npm  v2.1.18
remote:        npm ERR! code ELIFECYCLE
remote:        npm ERR! ws@0.4.12 preinstall: `make`
remote:        npm ERR! Exit status 2
remote:        npm ERR!
remote:        npm ERR! Failed at the ws@0.4.12 preinstall script 'make'.
remote:        npm ERR! This is most likely a problem with the ws package,
remote:        npm ERR! not with npm itself.
remote:        npm ERR! Tell the author that this fails on your system:
remote:        npm ERR!     make
remote:        npm ERR! You can get their info via:
remote:        npm ERR!     npm owner ls ws
remote:        npm ERR! There is likely additional logging output above.
remote:
remote:        npm ERR! Please include the following file with any support request:
remote:        npm ERR!     /tmp/build_f683313bc695999479a087d6a4181586/npm-debug.log
remote:
remote: -----> Build failed
remote:
remote:        We're sorry this build is failing! You can troubleshoot common issues here:
remote:        https://devcenter.heroku.com/articles/troubleshooting-node-deploys
remote:
remote:        Some possible problems:
remote:
remote:        - node_modules checked into source control
remote:          https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git-
remote:
remote:        Love,
remote:        Heroku
remote:
remote:
remote:  !     Push rejected, failed to compile Node.js app
remote:
remote: Verifying deploy....