Better logging for Glog

cc @wlaurance

I am not overly keen on bringing additional dependencies into the project, but at the same time it would be nice to have better logging in Glog.  I created a small Logging library for use with one of the other projects, and am proposing to integrate it into Glog.

The library is called (Glogger)[https://github.com/guyht/glogger] and is a very bare bones wrapper around (winston)[https://github.com/flatiron/winston], setting up some default levels and prompts.  It also has built in Loggly support.

Putting this forward as a candidate for integration into the master branch of Glog.