Added author_name and provider_name fields to Embed model
Embeds: Save author_name and provider_name if set
Display embed author/provider in admin if set
Added changelog entry
Cleanup wagtailembeds
Use templates for rendering embeds
Fixed issue with invalid javascript being returned by the chooser
Merge pull request #226 from kaedroho/embeds_author-and-provider-fields

Add author_name and provider_name to Embed