Clarify extension creation instructions in README #392
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The "Creating a Spatial Rails App" previously said "The adapter will add the PostGIS extension to your database.", which isn't true since this commit: 418c027
I updated the readme instructions to add the migration to create the extension in the "Creating a Spatial Rails App" section. It was then almost identical to the "Upgrading an Existing Database" section, so I merged the two into a new section called "Setup".
I also went for the newer style
default: &default
style for theconfig/database.yml
part.Fixes issue #389
Thanks @BuonOmo for the pointers