Models, Models and Rake Tasks

## Description and Impact
Makes it someone useful, allows you to import data from github and store it in a database


## Rollback Plan
* To roll back this change, revert the merge with: `git revert -m 1 MERGE_SHA` and perform another deploy.

## URLs
> localhost:3000/hubification

## QA Plan

#### Risk Level:
- [X] Low
- [ ] Medium
- [ ] High

start it up, run migrations. 

Run rake app:populate:{users/pulls/comments}, checkout out /hubification to see that it works.
You don't need the `()` here:
```ruby
github_comment = github_comment.to_h if github_comment.respond_to? :to_h
```