Update to custom logger

Hey Evan,

Updated the custom logger for fh-health. Shouldnt be any issues with formatting etc and all test have passed. 
Have a review let me know what you think, and feel free to change anything dude.

**Main changes:**
    - Moved silence logs to Logger module, update exports.silent
    - Added moment.js for current date output!
    - Updated custom logger to be more robust!