Making 's' and 'v' respond instantly

I think it's good to keep vim's default behaviour for the basics / most used things... It's a way of minimizing the amount os stuff we have to (re)memorize when switching normal VIM to YADR's vim.

And, personally, I was feeling a drag when trying to use the old `s`. I was annoyed when I tried to `ss` for substituting the char `s` under the cursor and continuing typing :) when all of a sudden a split opened :smile:

The same goes to `v` (visual char).

So for the split joins I put a comma before the mappings. Still easy to remember and mnemonic.

And for the window shortcuts I had to remove them for not being able to find a better non-conflicting map. (`,vv` and `,ss` already do something else). And, to be honest, most of the times I open a vertical or horizontal split it is via Ctrl-P or NERD tree, not via an already opened buffer... So I wouldn't mind, in these more rare cases, doing the old `<C-w> s` for that...