add option to silence errors

[maxbeatty]

ref #58

add option to silence console.log when error occurs while reading and parsing files

[jcblw]

I prefer this over #61 👍

[wzrdtales]

I don't prefer my or this solution. I'm fine with both, it would be great to get the ability to handle the error on the application that uses the module, but that's the only difference. ;)

[maxbeatty]

Just thought of how you could control output based on environment in case you want the verboseness during development but not in other environments:

require('dotenv').config({silent: process.env.NODE_ENV !== 'development'})