added tests to prevent problems like wolph#157

extended samples tests

fixed bug wolph#154 "Progress bar display does not update", again...

fixed docs build for newer sphinx releases

updated appveyor python version

fixed tests for new flake8 release v3.34.4

Bumping version for signed releases using gpgit v3.34.3

added travis release uploading v3.34.2

added travis release uploading v3.34.1

Made progressbars reusable by default (wolph#136) and added support f…

…or custom character width function (wolph#137) v3.34.0