Add config object and window title with current tab directory

[trystan2k]

Hi,

I made this PR with changes I made locally to your (awesome, btw) theme to be able to configure the colors from the config file (I like the terminal with a black background and some specific color setup).

I also have added a feature that can update the terminal window title with current tab directly, so if you have a lot of tabs opened (like I normally have), you can still see the current directory easily in the title bar.

I hope you like the changes.

If you have any question or suggestion, please let me know.

Thank you !

Regards,