v0.1, 2017.7.23 -- Initial release.
v0.2, 2017.7.23 --Fixing pypi issues
v0.2.2 2017.7.23 --Updated for python 2
v0.2.4 2017.7.24 --Changed to threading and callback model
v0.2.5 2017.7.25 --Changed to monotonic, for python 2.7
