Changes for version 0.021
- fixed the homedir mocking bug of the test suite for Mac.
- no longer skipped those tests marked as linux_only on non-linux systems.
Documentation
Run commands on clusters
Expand patterns to machine host list
Push SSH public keys to remote clusters
Upload local files/directories to remote clusters
Modules
Cluster operations based on parallel SSH, set and interval arithmetic
Expand set arithmetic expression to host list