webpack coffeelint options don't work without ./coffeelint.json or options.configFile set

if a file backed coffeelint configuration is not found, none of the coffelint options set in webpack will be used either. i.e you must have  ./coffeelint.json or options.configFile set before you can use options in webpack configuration itself.

https://github.com/bline/coffeelint-loader/blob/master/index.js#L36
