Autogenerate lostcast.xml items from some data

[geoffb]

We should create a data structure for podcast in _config.yml which is used to generate the lostcast.xml file. (As opposed to adding new items directly to lostcast.xml)

We'll need the following fields:

• Title
• Subtitle
• Summary
• URL
• Publish Date
• Duration

[richtaur]

asana