Expiscor Administer Daily Discovery Pull Requests

* Flesh out Client by wrapping Octokit requests
* Reviewer fetches and initiates Pull Request reviews
* PullRequest encapsulates review
  * Defines an acceptable Pull Request
  * Merges when acceptable
  * Asks for fixes when unacceptable
Don't hardcode credentials
Merge pull request #1 from dailydiscovery/administer-pull-requests

Expiscor Administer Daily Discovery Pull Requests