What is Buddhist Modernism?

This question refers to "Buddhist Modernism" however I'm not sure what it is. It is a term that I have heard crop up in a few other places. Is it a reformation movement within Buddhism? If so what is it reforming and when did it occur? Is it particular to one school of Buddhism? Is it a related concept to Navayana Buddhism perhaps? Is it a real movement at all or just convenient shorthand for Buddhism as it enters the modern world?