added icon, added images for main page, added gray box for about page, make_money page in progress
Merge branch 'filling_in_layout' of https://github.com/vsutan/lightgraphos into vsutan-filling_in_layout

pulling new messages
added config.secret_key for devise
added config.secret_key for prod only for devise
added configuration for default url options for environments production.rb
added configuration for default url options for environments test.rb
added configuration in prod env file for smtp gmail
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