UnicodeDecodeError on tmux.conf parsing, incorrect windows base index used for switching to first window on session creation

Hey mate,
First of all, great great package.

I did 2 things:
1. Removed decoding of output of 'tmux show-options -g -t' since it causes UnicodeDecodeError when ~/.tmux.conf contains non-ascii chars (For example, when using powerline to format the status-line). I'm not sure what the decoding was there for to begin with, so it might not be the best way to solve it. Works for me anyway.
2. Fixed what appears to be a typo in the function that switches to the first window and pane after session creation.

Thanks mate!
Roy