Add helper method to set "location" parameter in librecipe.

Set to buildout['buildout']['parts-directory'] + name.
Used in 50% of the recipes.
Add dependency to h.r.download.
Add download helper function in librecipe.

Simple wrapper around h.r.download
Update pinned egg versions in LAMP stack.
Add lamp-generic SR.
Add temporary request-edge recipe
Add publishsection recipe.
Add 'edge' support for lamp-generic with 'edge' software_type.