Update Vim python configuration

PEP8 requires that doc strings should have a maximum length of 72 characters in
length. I have added a second color color at line 72 to watch this.
Added tmux configuration

Make sure that tmux runs in 256 color mode.
Updated iTerm2 conf to customs panes

Removed title from panes and set tab to always show.

Also disabled hotkey as I never use.