Batch action not in admin on 0.3.4

[gabriel]

When updating administrate_batch_actions from 0.3.1 to 0.3.4, the batch actions got renamed, for example, from merge_batch_action_admin_albums to merge_batch_action_albums. Somehow the admin namespace was lost?

[gabriel]

This is the change that broke it:

092e678

[andreibondarev]

@gabriel Thanks for flagging it! Any chance that you willing and able to work on a PR to fix it?