.byebug_history included in default Rails5 setup (https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/app/templates/gitignore)

I know this is petty, but imagine thousand upon thousand of corrective commits saved by fixing the typo right into the heart of the file.

Couldn't find any references to .powconfig  being used in application directory

bower-rails integrates bower.io into Rails, it allows you to have everything in a Bowerfile and install all vendor assets easily.

I added secret_token.rb file to the gitignore as there are public repos sharing it.

.project files come from Aptana Studio, a Rails IDE.

The possible files could be database.yml or sold.yml

Unless full paths are used .gitignore, all matching files and folders will be ignored, however deep they are in the repo.

For example, ignoring log/* doesn't just ignore all log files, but also files such as lib/project/log/awesome_logger.rb.  It's a mistake I've made a couple of times but never seemed to have learned from.