Basic module setup
Added basic error methods
Added travis yml
Ensuring error code is a HTTP status code
Fixed misspelled var
Wrong keywords in package.json

Referred to other module
Small change in readme

Something left over from other module
Check for message in tests

When message is added based on code.
Support printf-like formated message
Do less

No need to slice args if we won't format message.
Format message example in readme
Renamed module to error-factory
Merge pull request #1 from Springworks/chore/project-setup

First functionality for creating errors with status codes