grouped sqlite into the development and the test environments only.

in the production environment, it will install pg instead
Tried another method to ensure that sqlite is not installed
in production environment
Commented out the sqlite gem statement
Edited the database.yml file
As per the answer on stack overflow [1] changed the value of these 4 things in 
the production environment

[1]: http://stackoverflow.com/questions/16271696/cant-get-css-working-on-heroku-using-rails-4-with-bootstrap-saas-gem
Merge pull request #1 from icyflame/heroku-deploy

Production environment setup