Merge pull request #1 from rdunklau/master

Add multi-slot behaviour to postgres eclass.
Rename eclass

Since this eclass overrides functions it isn't suitable for use when
just the slot needs to be checked.
Don't check for pg_config because eclass won't return false positives.
Implement new postgres-multi.
Rename functions in postgres-multi, added functions for postgres,
replace @PG_SLOT@ with $PG_SLOT in wrapper.
version bump
Rename inherit and function calls. Add 8.4 to the compat list.
Wrapper to reduce typing.
Update for RC1.
Inherit postgres-multi
Inherit postgres
Add documentation and export the foreach function.
Merge branch 'master' of github.com:rdunklau/titanofold-gentoo-x86