move variables into 'global' and host-specific locations

as recommended by ansible: <http://docs.ansible.com/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable>
Manage ssh-keys
Add and consistent renaming of hosts, adjust uids
Adjust zencoder and dropbox for new zhdk prod setup
Set 2.0.13 as stable; add newrelic monintoring and database backups
Version 2.0.15
Update roles/debuntu-setup
Update admin playbook; set some defaults; fix minor issues
Madek can be put behind http_basic_auth

which is in general a bad idea; but since requested by some party ....
Set stable version to 2.1.0 for prod.zhdk
Add color config, add logrotate, update, minor fixes
Sett 2.1.1 as stable version
Fix typo on colors.sass, copy colors to _colors
Unify hosts_vars layouts

so it is easier to see diffs
Configure passenger for performance; add ZHdK-secrets
Update arch secrets, flexible admin login
Set 2.2.0 as stable version