Merge pull request #34 from rayshih/master

[refactor][bug fix] rewrite the LOG.error function
[others] minor changes
[update packages] body-parser->1.8.2, cookie-parser->1.3.3, csurf->1.6.1, express->4.9.1, express-session->1.8.2, inflection->1.4.2, js-yaml->3.2.2, moment->2.8.3, mongoose->3.8.16, serve-favicon->2.1.4, serve-static->1.6.2
v0.24.4
[bug fix] print err.stack instead of err name