Switching logging to Bunyan#23

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sntran wants to merge 6 commits intodtex:masterfrom

sntran-contrib:logging

Commits on Jul 14, 2015

Switch from Winston to Bunyan for logging
Son Tran-Nguyen
committed
Ensure valid log level config
Son Tran-Nguyen
committed
Remove all references to winston
Son Tran-Nguyen
committed

Commits on Jul 15, 2015

Add event log to prototype instead of function
Son Tran-Nguyen
committed
Using child loggers to have more fields
Son Tran-Nguyen
committed
Support logging to Loggy
Son Tran-Nguyen
committed