Updating Procfile.

1 - Makefile updated for heroku commands.
2 - Renaming files and removing their content.
Adding error pages and tests for them.

1 - Adding a sublime-project file.
2 - Adding and correcting commands in Makefile.
3 - Updating README.md with the right commands.
4 - Updating .gitignore .
5 - Updating setting files.