• Removed paramiko library usage

• Added the ability to create PostgreSQL nodes on remote hosts via SSH. All local commands, such as directory creation and file reading, have been moved to the LocalOperations class. Remote commands are now housed in the RemoteOperations class. The class is selected depending on the parameters passed to PostgresNode.

• Introducing support for specific PostgreSQL versions

• Minor enhancements in test syntax

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And revert cdc933ff4af.

Small fix: PostgresNode.safe_psql() now raises error on wrong input (issue #52).

Small fix: make NodeBackup aware of inheritors of PostgresNode.

• Add suppress option to PostgresNode.poll_query_until() (PR #51);
• Add format option to PostgresNode.dump() (PR #32);
• Add promote() method to PostgresNode (PR #47);
• Add version property to PostgresNode (PR #49);
• Add support for logical replication (PR #42);