index view that displays all posts.
Posts now show up in descending order

Posts are shown in descending order by post.id. This should be effectively the same as
showing in reverse chronological order as post id is autogenerated upon creation.
added profile route for user
Merge branch 'master' into user
Merging master
Merge pull request #9 from alexcodreanu86/posts

Posts
Merge branch 'master' into user
Merge pull request #10 from alexcodreanu86/user

User added profile route
posts now have a user_id associated with them.
you can now see all of the posts associated with a given user on the user show page.
users can now update and delete posts from their profile page.
Merge pull request #11 from alexcodreanu86/associations

Associations
tests for user profile page
fixed merge conflicts
Merge pull request #12 from alexcodreanu86/user

User