set production db to use pg
updated rake version, switched db gem from sql to pg, made changes in locales/database.yml to reflect changes
removed pg usernames, successfully running locally
precompiled using rake --trace assets:precompile to precompile
precompiling again after initial attempt failed
installed rails_12factor gem for use with precompiled assets
added asset_path to css for rendering background image
run precompile to reflect changes in css rendering background image
wrote correct precomiled filename for background image in public assets
add hyperlink to heroku deployment