Need comment describing method parameters, especially first parameter that is a [format string](http://www.ruby-doc.org/core-1.9.3/String.html#method-i-25).
Need to update [example](https://github.com/bbfsdev/bbfs/blob/master/examples/log_example.rb)
Need to notify all the team regarding new usage, cause it's an important feature that we use a lot.