Remove secret key from end_user.py.dist
Move settings around in settings.py.dist
Change manage.py reference to settings
Merge branch 'pbanaszkiewicz-bug/15105' into develop

* pbanaszkiewicz-bug/15105:
  Change manage.py reference to settings
  Move settings around in settings.py.dist
  setup.py: install package data
  Fixing MANIFEST.in
  Reverted settings.py.dist, fixed importing issue
  Fix settings to work with new gwm-manage.py
Docs: Updated installation instruction for devs
Ignoring: settings files (.gitignore in their dir)

I put .gitignore in directory containing settings files, which ignores
non-dist versions of settings for both "normal" and LDAP setting files.
Getting rid of mentions of 'end_user.py'