s/sever/server/g
Warn about tmux version requirement
Adds the option to override host mode

This change allows a host user to pass "client" as the first
command-line argument in order to access the client mode commands.
Merge pull request #10 from geeksam/patch-1

s/sever/server/g - Oops!
Merge pull request #12 from rubycut/patch-1

Warn about tmux version requirement
Merge pull request #13 from jballanc/client-mode-override

Add the option for host to join in client mode.