auto_save_to option added

[cirosantilli]

The doc diff explains exactly what this does.

Fixes #79 if user adds the following to his .vimrc:

let g:session_autosave = 'yes'
let g:session_autosave_to = 'default'
let g:session_autoload = 'yes'

[xolox]

Hi Ciro and thanks for the pull request! This is now merged and published as vim-session 2.12. I made some minor changes while merging because this could no longer be merged automatically, but the option name is the same so it's compatible. Sorry it took so immensely long, I have 30+ open source projects and struggling to find free time to maintain all of them :-). Happy Vimming!

[cirosantilli]

Ha, surprise!

No worries, I know what you mean, PR review does take time and is a risk.

Cheers!