Adds rake application:config:dev to copy over example config files during initial setup.
Switches to rails_config's config/settings/<env>.yml for per-environment config. (Excludes analytics settings from test.yml to avoid the GA key stuffing up the written-out-and-compared-with-PHP-output test fixtures.)
Adds Ruby/Tidy/MySQL install instructions and new application:config:dev rake task to README.
Merge pull request #518 from damncabbage/setup-rake-task

Adds a application:config:dev setup rake task; clarifies README instructions.