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.
this is how I would populate models
```
# I would change the name of this. We can just silently ignore if the user exists already
def create_user(user)
 return if Hubification::User.where(:id => user[:id]).first).nil?
 user_attrs = user.to_h.slice(*Hubification::User.column_names.map(&:to_sym))
 user_attrs[:role] = user[:type]
 Hubification::User.create(user_attrs)
end
```