datepicker issues

[pjam]

I've been having some issues on putting a datepicker to work. I was having the same problem as in #188 and got it fixed (then I updated to 1.3.8) but the calendar shows up without any styles applied. Am I missing something?

Also, please clarify me some questions:

1. What's the expected picker? jQueryUI or bootstrap-datepicker (like in the AdminLTE demos)?
2. Is the data-datepicker attribute needed?
3. Do we really need to call $(...).datepicker() manually in our code?

Thanks for all the help you can give and keep up the good work.

Debug info

Component	Version
Symfony version	3.3.16
AdminThemeBundle	1.3.8