Adds quiet_assests gem

The asset pipeline has SOO much to say. I don't need to hear all of it.

https://github.com/evrone/quiet_assets
Removes heroku gem

This gem is deprecated. The Heroku Toolbelt should be used.

https://toolbelt.heroku.com/
Adds rails-default-database gem

"Tired of cp config/database.example.yml config/database.yml? Me too. That's why I wrote this Gem."

https://github.com/tpope/rails-default-database
Adds work style :test, :development gem group

I removed capybara because I don't use it, but I probably should.
Adds pg gem

I assume this is running on Heroku since I removed the heroku gem.
You need the pg gem for Heroku.
Merge pull request #1 from homesteading/gemfile-jlsuttles

Gemfile edits by @jlsuttles