Align with Refactor remote services 27x #3657 / restored geonode.celery to geonode.celery_app #3531

Improvements to GeoNode Proxies

Fix celery app dependency

Update to Django 1.9.13

Fix requirements

Fix test-cases

Compatibility with Django 1.9+

Improve HTTP Proxies

Fix deps versions

 - Fix typos

Fixes #3512

Refactored remote services [1]

Refactored remote services [2]

Readded ServiceForm, which had been inadvertently removed

Merge branch 'refactor-remote-services' of github.com:ricardogsilva/geonode into refactor-remote-services

Tests and Pep8 issues

Tests and Pep8 issues

Add missing resources from master branch

Fix maps js

Fix pep8 issues

Fix celery dep

Align with PR #3660

Align with Refactor remote services 27x #3657 / restored geonode.celery to geonode.celery_app #3531

 - Update dependencies and fix test cases

 - Update dependencies and fix test cases

Fix tests

Fix tests

Fix te...