Vim: toggle folds with <space>

The old mapping was funnily enough not all that useful. Let's try this
instead; it might even get me to get out of the habit of doing a `zR`
every single time I open a new file (nervous tic).

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Vim: 'wildignore' some more vendor directories

In my website repo, for example, there are 6,973 files in these
directories which I never look at, and which needlessly slow down file
searches.

Signed-off-by: Wincent Colaiuta <win@wincent.com>