* which --> variant
* which --> alias
* which --> format
* improve param names in codeclimate
* improve param names in github-issue-detail
* update github-issue-detail unit tests
* refactor(GithubIssueDetail): ported to new service model
* refactor(GithubIssueDetail): updates based on PR discussions
* refactor(GithubIssueDetail): minor updates and additional tests
* refactor(GithubIssueDetail): minor updates to render functions per PR disc.