0.92.0

This release contains a regression - do not use. 0.92.1 or later should be used instead

Changes:

• ParallelSSHClient.join no longer consumes stdout/stderr - only waits for command completion
• A ParallelSSHClient.finished function has been added for non-blocking check if commands have finished
• OpenSSH config reading also uses port and key configuration - #55
• stdin buffer has been added to output - see documentation for usage example
• Helper function for reading an OpenSSH compatible config added to pssh.utils