Added missing fields from API and removed fields that are not returned by API#1039

Merged

haacked merged 3 commits intooctokit:masterfrom gabrielweyer:fix-api-fields

Jan 2, 2016

+69-27

Commits on Dec 23, 2015

Added Id And Locked properties to Issue, fixed XML comment of Update Issue (was a copy of Create Issue)
gabrielweyer
committed
Added CommitUrl to IssueEvent
gabrielweyer
committed
Removed Assignee and Labels from IssueEventPayload
gabrielweyer
committed