Added associations and validations

Added the assosications shown in our schema in README_img.  Discovered
that we were missing a validation that requires a post to have a user.
So we added it.
Updated project status on the README
Added index view

Created view called index.erb that shows all posts in a list.  Yay.
Added post view and added comment counts to index view

Created post.erb which is our view for post.  Created it according
to the wireframe in README_imgs.

In index.erb created /posts/:id route, which displays a post and
a comment. Comments were displaying in an odd order, so we learned
how to use the sort_by to arrange them by date.
http://ruby-doc.org/core-2.1.0/Enumerable.html#method-i-sort_by

Also added comment count to index.erb.  Go us!
Added add comment form to view

In the style of hacker news, we created a comment form in the view.
It is not currently attached to a route.
Created an add post view. Added get route for creating a post.

Created add_post.erb and a get route called /posts/new  This takes us
to our create route form.
Creating users is working

Added new user view called new_user.erb
Added get users/new route to go to new user form
Added post users/new to insert new user into database

Also checked to see if sessions were a thing that is added
automatically into our current sinatra setup. Good news! It is!

And with all that, we can add new users!
Added ability to craete new post

Modified the new post view
Finished post route 'posts/new' so that we can insert new posts into
our database

Yayyy!  That was fun debugging!
Added the ability to add comments

Added a comment controller with a post route comments/new
which inserts new comments into the database

Changed index.erb. Tara: I'm not sure what was changed because I don't
know the git command to check what lines were changed in index.erb

Changed post.erb to have a working comments form that lets people
comment to their heart's content.

Yay for new feature!
Created user page

User shows user name, e-mail, and two links listing all of the
user's submissions and all of their comments.

We created a submissions page that shows all of a user's submissions
We created a route users/user_id/submissions that give sus
the submission view.

We are working on creating...
a comments page that shows all of a users comments
We inclucded a commetns route users/user_id/comments
Added sign-in page

Added a sign-in view called sign_in.erb
Added a Post route to user to accept the sign_in information
Only permitted sign-in if the password matched the user password in
the database

Don't remember why we modified comments, and don't know how to
check what we modified.