Logging doesn't work when pulsar installed through npm.

Error: ENOENT, no such file or directory 'bin/log4js.json'
    at Object.fs.openSync (fs.js:432:18)
    at Object.fs.readFileSync (fs.js:289:15)
    at loadConfigurationFile (/usr/local/lib/node_modules/pulsar-rest-api/node_modules/log4js/lib/log4js.js:192:26)
    at Object.configure (/usr/local/lib/node_modules/pulsar-rest-api/node_modules/log4js/lib/log4js.js:256:14)
    at Object.<anonymous> (/usr/local/lib/node_modules/pulsar-rest-api/lib/logger.js:2:8)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)