error handlers, models, config

Added some error handler for production and development
Simple User model with password and salt + session + cookie
Added config directory with config.json + .env for environment
variables with node-env-file module
pkdg.json up
Merge branch 'master' of https://github.com/canvaskisa/node-gulp-starter

Conflicts:
	build/views/index.handlebars
	package.json
gitignore up