Add milestone document and api
Get milestone data when retrieving pull requests
Get milestone info with PR

Issues are now contained within milestones, and PRs
are wrapped to incude the milestone info.
remove milestone API
Fix pull list styles
Get issues via the milestone
Get issues via milestone instead of label
Add milestone service and document to issue api test
Modify test to expect issues.getMilestone
Close milestone when PR is closed
Add pull_request:closed socket io test
Add io called and calledWith assertions
Remove trailing whitespace
Add milestone service tests
Merge pull request #468 from reviewninja/feature/milestone

Use milestone to group issues
Initialize empty object for issues if no issue
Add passthrough for HUBService and RPCService
Check to ensure milestone exists
Remove dangling comma
Update milestone services tests