Update PullRequestReviewComment event

Closes #257
Update the gist classes
Update git module
Fix updates to git module
Begin work on issues module
Fix matcher for requests 2.4.0
Finish updating issues module
Update notifications module
Update orgs module
Update pulls module
Update repos module
Update search module
Update users module
Last few clean up instances
Add missing call to super
Split out authenticated user logic into GitHub#me
Add integration test for GitHub#me
Add GitHub#repository_with_id
Re-alphabetize GitHub methods
Add GitHub#user_with_id