"Booleanify" relevant postgresql attributes

Note that it is hopefully not required to convert ruby boolean values as 'on' / 'off' in templates,
since "Boolean values can be written as on, off, true, false, yes, no, 1, 0 (all case-insensitive)"
See http://www.postgresql.org/docs/9.3/static/config-setting.html#CONFIG-SETTING-NAMES-VALUES
Fix two bugs in postgresql dependencies

- depends on apt for "apt_repository" lwrp
- ramfs dir attribute should be overridable
Fix and reorganize postgresql recipes

Cookbook gist:
1) Install all required packages without any special customization
2) stop all instances
3) Configure CI specific stuff (multiple instance on same port, RAM disk storage, Parameter tuning)
4) restart default intance
Update to Gradle 1.8