added config env for heroku
set config env variable to heroku and use that in staging env file
changed staging env file to not use a config variable in heroku
updated devise.rb config.secret-key to not have if rails prod
added config.assets.precompile += image files to dev, staging, and prod env files
changed onfig.serve_static_assets = true for staging and test
updated production.rb to set config.action_mailer.default_url_options to ACTION_MAILER_PROD_URL which is config to clyqe.herokuapp.com in heroku