Added default files and standard modifications

Added the following files:

  * config/gemrc
  * config/railsrc
  * public/config/database.yml
  * public/gitignore

The vikingo-rails-config Thor task will perform the following modifications to
the new project:

  * Remove the log/ directory
  * Remove the tmp/ directory
  * Remove the test/ directory
  * Remove the README.rdoc file
  * Remove the default .gitignore file
  * Generate a secret token
  * Rewrite the Gemfile
  * Rewrite the secret token file to read a token from file
  * Copy a default config/database.yml file and make backups
  * Ask the user for edition of the config/database.yml file
  * Create the specified databases
  * Run pending migrations
  * Create a new .gitignore file
  * Initialize git and commit the files created by the project
  * Create a heroku application