Allow running as login shell

There should be an option to run the terminal as a login shell, perhaps a checkbox on the DConf settings would do.

For lots of uses a power user might have this required, such as for running RVM (Ruby Version Manager), keeping the setting hidden might be acceptable, but it should at least be available.

Not sure why so many options are hidden away for the terminal, since is mostly power users who will use it, or want to customize it, tho.

BTW, the "shell" option doesn't work trying to use "--login" as a parameter.

I'm testing this with zsh, not sure about bash but I would expect the same result.

And just a note, searching about this on Google yielded "install gnome-terminal" as a solution... I hope you guys don't feel the same way.

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Elementary Luna x64
Pantheon Terminal 0.2.4.1

Launchpad Details: [#LP1264842](https://bugs.launchpad.net/bugs/1264842) AndresClari - 2013-12-29 14:53:33 +0000