update todo list in README.
merge...
Gemfile: call pg gem for postgresql.
update config database.
Gemfile update
config database.yml...
add db config into database.yml for test and prod settings.
add rake tasks to git_submodule init.
git submodule...
git submodule...
api pswd.
Procfile.
divers.
divers.
Add a Procfile for foreman launch.
Merge branch 'heroku'
RAILS_ENV=production bundle exec rake assets:precompile
heroku db config in the database.yml
if no categories...
categories helper debug.