passing -t to cmd() apis breaks running some progrmas

[ficoos]

For all objects passing "-t" somewhere in the cmd overrides the object being referenced.
This breaks running commands that have -t in them (e.g. ssh).

pane.cmd('respawn-pane', 'ssh', '-t', 'user@host')

[tony]

@ficoos Hm. Can we have a PR and a test case made for this?

Maybe #79 will help

[ficoos]

It's actually a pervasive part of the API (it's in all objects). It was not a good decision IMHO and I would gladly see it change. I can modify the API so that it always injects the appropriate '-t' for the calling object. This will mean that only the Server can be used to send command to a random target (which is fine by me).
This change will break existing users.