cherry-pick Adding hook to end of list table
Added hook for table footer, column space for checkbox
Adding custom_action_link action
Renaming action hook
Updating delete checkboxes
Adding support for extending column defaults
Inline comments clean up
Adding checkbox column
Merge branch 'cherry-pick' of github.com:x-team/wp-stream into cherry-pick
Merge pull request #151 from x-team/cherry-pick

Changes needed for Cherry-Pick extension