Created one migration and 3 models: user, comment, and posts

Created a migration and the three models defined in our schema.  See
README_imgs for schema.  Validations are included.  Have not set up
associations.  Migration was run, no seed data, no testing in the rake
console.
Added two new validations to the comment model

Comments not require a user id and a post id to prevent anonymous and
orphaned comments.  Every comment should belong to a user and
to a post.
Merge branch 'master' of https://github.com/KevinFalank/news_clone1

Updating local to match remote repository.

it.