Allow mass deletion of episode drafts

[pstjean]

Right now, there is no way to delete multiple episodes, which is a problem now that we allow the mass creation of episodes (via the series planner). If someone makes a mistake during series planning, they either need to delete each episode one by one or have us remove them in the back end.

[brandonhundt]

I will watch this doing user interviews.

From Sandi:

Watch on series imports.