deposit: DOI import fix and code clean up

* Fixes de DOI importing

* Organizes and prepares js code to add ArXiv and ISBN import

* Adds some documentation on the js file

* Replaces DOI, ArXiv and ISBN inline forms from LiteratureForm
  by single fields and a single import button

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>