Develop Heroku modules + fixes
I have developed the next modules for the Heroku provider:
- heroku_account
- heroku_addon
- heroku_app
- heroku_build
- heroku_cert
- heroku_collaborator
- heroku_config
- heroku_domain
- heroku_drain
- heroku_formation
- heroku_pipeline
- heroku_slug
- heroku_space
- heroku_team
Also, I fixed and refactored few modules for the AWS provider.