Number of comments reviewed

## Description and Impact
Adds the number of comments a user has reviewed to the "User Show" page

## Deploy Plan
No worries.

## Rollback Plan
* To roll back this change, revert the merge with: `git revert -m 1 MERGE_SHA` and perform another deploy.

## QA Plan
Small feature addition, just check that users have reviewed comments
#### Risk Level:
- [x] Low
- [ ] Medium
- [ ] High

#### Happy Path Scenarios
Checkout a user, make sure they have pulls reviewed. If elliothursh is a user in your database, make sure he has 0 pulls.