JOINDIN-467 Add paragraph about how to define global gitignore
language tidy-up
Add the gitignore instructions
Added unattend API and XHR action to remove attendance
Web interface changes for attending toggle
Add unattend action for no JS fallback for attending toggle
Merge branch 'asgrim-joindin-473-asgrim-not-attending'
Merge branch 'master' of github.com:joindin/joindin-web2 into JOINDIN-468