Add convention test to ensure pagination methods meet naming conventions

[hnrkndrssn]

• Convention Test
• Update all methods that failed the convention test
• Breaking changes all around
• [ ] [:cherries: on top] Convention test to include Observable clients...this would be caught in the SyncObservableInterfaces test though...so might not be urgently needed.

Fixes #767 #768 #769 #770 #772

[hnrkndrssn]

Nice little sample of what errors for this convention test will look like 😬 https://ci.appveyor.com/project/Haacked15676/octokit-net/build/1.0.847/tests

[hnrkndrssn]

As long as AppVeyor gives me a nice green ✅ this is ready for review

cc @shiftkey

[shiftkey]

this would be caught in the SyncObservableInterfaces test though...so might not be urgently needed.

That was my thinking on this too. I think we can drop this unless there's another reason to test the observable interfaces explicitly...

[hnrkndrssn]

Dropped 😃

[shiftkey]

Thanks heaps for working through this!