workflows: INSPIRE approval action fix

* Amends inspires_approval action to save its outcome
  to the extra_data of the object so workflows using
  this action will be able to branch their execution
  paths depending on the outcome of the action.

* Adds task halt_to_render in order to stop the workflows
  execution render and the completed submission template
  before before long tasks start so the user wont have to wait.

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
deposit: literature workflow fix

* Amends literature workflow to take different
  execution paths depending on the inspires_approval
  outcome.

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
deposit: add new submission (with no approval)
workflows: several updates

* Finalize the literature workflow that interacts with robotupload
  and the Holding Pen.

* Fix missing encoding in some files.

* Add receivers.py file for handling signals from the workflows
  module.

Co-authored-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
deposit: fix for DOI page property when undefined

* Closes #77.

* Passes JSHint and JSBeautifier.

* Filters out the returning object of undefined values.

Signed-off-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>
base: default breadcrums

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
accounts: login template

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: save field after import fix

* Validates each field modified after import instead of saving
  the whole form. (Closes #80)

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: contributors rename to authors

* As we are triggering a dataSaveField event to save each imported
  field, the name of the field should match the name in
  forms.py.

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: plupload allow PDF only

* Adds filters to plupload in order to only allow uploading PDFs. This
  filter can be extended in the future to add more mime types as needed.

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: duplicate validator with prod inspirehep

* Queries inspirehep.net to check if a submited publication is
  already in the production db.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>