Merge tag '1flow-0.28.1.9' into develop

0.28.1.9 1flow-0.28.1.9
Paramiko avoids flipflaps. Follow sparks@develop.
Include billiard & kombu, celery seems to have lost its ability to install its own dependancies. Follow sparks@develop.
Don't show internal feeds anymore, this is a privacy issue in production.
Adapt to modern compass.
version bump for 0.28.2.
Merge branch 'release/0.28.2'
Fix the installation link in the readme.
Merge branch 'hotfix/0.28.2.1'