deposit: datetime picker library modification

* Changes the datetime picker library from the jQuery UI to https://github.com/Eonasdan/bootstrap-datetimepicker.

* Increases the consistency with the Bootstrap design.
Yes, you are right @pedrogaudencio . In this case it will be installed anyway.

@jalavik If you need to use moment.js in other parts of the code then he can explicitly add it in the bundles of holdingpen as a bower dependency. @GiorgosPa