Compress-pptx

* Change executable name for harmonization purposes.

* Improve setup.py.

* Remove release script.

* Format setup.py and switch to markdown.

* Add warning.

* Update badge URL.

* Better error handling; check for magick command.

* Add badge to readme.

* Fix README.

* Add changelog.

* Switch to python package.

* Various updates, v0.2.

* Add TODO notice.

* Handle input errors.

* Update instructions, add script.

* Add script and README.

* Initial commit.