Re-work smux Script

[seanmalloy]

• [x] rename script to sshmux
• [x] Should also accept hostnames from the command line(not just an input file)
• [x] Should also accept hostnames from STDIN
• [x] Add support to auto detect current tmux session name

[seanmalloy]

Code is all written and pushed. Needs final testing before closing this out.

[seanmalloy]

Script successfully tested. All done.