Develop

ember_django/backend/settings.py
.private/.config.txt.enc
should be ignored, grnet/develop versions kept.

High level overview of changes:
[ES-181 comment](http://agile.escience.grnet.gr:8080/browse/ES-181?focusedCommentId=10589&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-10589)
Additionally first pass of login-status-aware changes (navbar banner button - orka)