Fixes for UnknownLength handling

New version packaged using cookiecutter template: https://github.com/…

…WoLpH/cookiecutter-pypackage-pythonic

Added full python 3.5 support

Added Python 3.x support and thanks @tnestmeyer for adding AbsoluteET…

…A widget

Full rewrite of the progressbar

v2.6.2 adaptive eta added

Added nicer defaults