Publish to Pip

[TheQuinbox]

I want to use this library in all of my Python GUI applications, and also supply a requirements file, for if I'm ever on a different machine, etc. However, I like to hardcode versions in requirements.txt files, so it reduces the likelyhood of things breaking. To do that with gui_builder not being on Pip though, I have to hardcode a specific Git commit hash. It would be much easier if this library (as well as a few of the other AccessibleApps ones) could be published to Pip.