Adde PostgreSQL database.
dquote>
dquote> Added pg gem to to Gemfile.
dquote> Created a Repos module under the PuppyBreeder module.
Created a repo_helper.rb that holds on the repo modules.
Required_relative the repo_helper.rb in puppy_breeder.rb.
Moved all other repos underneath the Repos module.
Restructured the set up in preparation for PostgreSQL.