Integrate bundler, create gemfile, config file

Create an initial gemfile to require all needed gems.
Create an initial config.yml file to store general settings for the app

See #8
Remove unnecessary brackets. See #8
Add 'rerun' to Gemfile. See #8

Rerun enables you to run a command everytime something in the directory
is changed. You could use it for rerun rackup to reload
your server everytime you make a change in the code
Change console to use Pry. See #8
Merge pull request #25 from ANamelessBand/08-create-gemset

Integrate bundler, create gemfile, config file