Cosmetic Changes

We run `rails g foundation:install` and `rails g simple_form:install --foundation`
to install

- Zurb Foundation, a frontend-framework to make things a little bit
prettier
- Simple_form, to make forms a bit easier

None of these gems are neccessary, but can make your life easier
Scaffold Submission resource

In this commit, we use the magic of Rails scaffolds. With a simple
`rails generate scaffold Submission link:string title:string votes:integer`
we let Rails create all the neccessary files.

Don't forget to add default: 0 to the votes column in
/db/migrations/2013....create_submissions.rb

Run `rake db:migrate` to create the database and `rails s` to see
the magic happen in your browser by going to http://localhost:3000/submissions

For cosmetic reasons, we remove app/assets/stylesheets/scaffold.css since
we already use foundation.
Validate Submission Attributes

We don't really want our users to submit titles nor do we want them
to submit links that are not links, so we need to validate user input.
Deploy to Heroku

Since we have a bare-bones application, let's just deploy. Fail fast.
Fake it till you make it. Lean. That stuff.

You can sign up for Heroku here:
https://devcenter.heroku.com/articles/quickstart

Then just run the following commands:

- `heroku create`
Creates the Heroku app
- `git push heroku master`
To push your code to Heroku
- `heroku run rake db:migrate`
To create the database on Heroku
Point root to Submission Index

Going to the root results in an error since we haven't defined it.
Remove Submission.votes from the form

We don't really want users to be able set the votes count, so let's
remove it from the permitted parameters as well as from the form.
Revamp the Website's layout

We are slightly modifying the layout to get a more reddit feel
Revamp List of Submissions

Let's make the list of submissions look a bit more like Reddit by
changing app/views/submissions/index.html with some additions to
app/assets/stylesheets/submissions.css.scss