Add nnir-spotlight recipe.

Use MacOSX sportlight as nnir backend to perform email lookups.

`el-get-check-recipe' output:
0 error(s) found.

Signed-off-by: Sébastien Gross <seb•ɑƬ•chezwam•ɖɵʈ•org>
Merge pull request #1349 from renard/nnir-spotlight

Add nnir-spotlight recipe.