Fix broken user list paginated scrolling

Closes #4695

- Adds a new class to the template and minor CSS to allow user list scroll events to work
Merge pull request #4696 from PaulAdamDavis/paginated-users-scroll

Fix broken user list paginated scrolling
Updated tag management UI with the post counts

closes #4683
- added post count to 'delete tag' modal
- fixed lint errors
- preventing extra data to be sent to server
- adjustments suggested by @jaswilli
Merge pull request #4689 from ekulabuhov/4683_TagPostCountUI

Updated tag management UI with the post counts
Merge branch 'master' of https://github.com/TryGhost/Ghost