Add a link to USOS API error response documentation
1.2: Merge branch 'beta'
Switch demo pages to a proxied USOS API server
Fix a broken bundle package.
Fix widget.tip demo (1.2 version is not 100% backward-compatible)
Add a missing link usosBadge widget in the API docs
Add usosBadge demo
Docs formatting
Fix build process (proper compression of bundle package)
Change JS and CSS formatting (tabs->spaces, etc.)

Information on USOSweb's commitFixer:
https://redmine.usos.edu.pl/issues/7849
1.2.1
1.2.2
1.2.2.1: Move entity-related stuff into separate files
1.2.2.2: Moved selector's entity setups into entities dir
1.2.2.3
1.2.2.4
1.2.2.5 - selector: "See more results" added