install less sooner
no longer need to load roles.sql
update url from pgdg to postgresql.org
rabbit does not need initdb
install lessc before make bootstrap
Fixes bug 1013494 - Remove Query model from the public API.
Merge pull request #2058 from AdrianGaudebert/1013494-query-pu

Fixes bug 1013494 - Remove Query model from the public API.
Fixes bug 1013308 - Replaced all lists of Super Search fields with one central list. r=peterbe
Merge pull request #2060 from rhelmer/install-doc-fixes

Install doc fixes