Fix titles on single selects (#738) and etc.
Fix titles on single selects (#738) and etc.

Also fixes an issue when actionsBox is set on a non-multiple select.
Fixes #1017. Add commentary explaining liObj.

tommydevdocs/bootstrap-select,nhahv/bootstrap-select,jesenko/bootstrap-select,emilmoe/bootstrap-select,coopsource/bootstrap-select,anhtranqs3/bootstrap4-select,Burick/bootstrap-select,performancematters/bootstrap-select,think2011/bootstrap-select,silviomoreto/bootstrap-select,coopsource/bootstrap-select,TeleginS/bootstrap-select,JoachimZ/bootstrap-select,chengky/bootstrap-select,QthCN/bootstrap-select,iaesaudi/bootstrap-select,nhahv/bootstrap-select,tommydevdocs/bootstrap-select,Burick/bootstrap-select,think2011/bootstrap-select,zhaoyan158567/bootstrap-select,silviomoreto/bootstrap-select,jesenko/bootstrap-select,nayosx/bootstrap-select,zhaoyan158567/bootstrap-select,wearespindle/select3,JoachimZ/bootstrap-select,emilmoe/bootstrap-select,bookbrainz/bootstrap-select,anhtranqs3/bootstrap4-select,chengky/bootstrap-select,bookbrainz/bootstrap-select,QthCN/bootstrap-select,nayosx/bootstrap-select,performancematters/bootstrap-select,wearespindle/select3,iaesaudi/bootstrap-select,TeleginS/bootstrap-select