* recipes/org-tree-slide.rcp: new recipe.

Signed-off-by: Yakkala Yagnesh Raghava <hi@yagnesh.org>
Check for required properties.

Signed-off-by: Sébastien Gross <seb•ɑƬ•chezwam•ɖɵʈ•org>
Merge pull request #1051 from renard/check-properties

Check for required properties.
Merge pull request #1049 from yyr/rec

* recipes/org-tree-slide.rcp: new recipe.
Merge pull request #1050 from yyr/feature

* .gitignore: ignore generated dir file.