2.5.x features

shows, show-schedules, show-preview, show-history-feed, item-history-feed endpoints to the HTTP api to be used via NewscoopAirtimePlugin

These endpoints are needed for airtime pro instances and should be merged to saas branch.
Also you're going to want to write a function that sanitizes this response by stripping fields from it. For example, you don't want to return anything related to live stream authentication (!)...
Strip these fields:
custom_username
cb_airtime_auth
cb_custom_auth
custom_username
custom_password
is_linkable <-- stupid internal flag