Update featured items style.
Use blacklight-oembed and update oembed block to use the helpers it provides
Merge pull request #735 from sul-dlss/682-featured-items-style

Update featured items style.
Merge pull request #738 from sul-dlss/723-oembed-plugin

Use blacklight-oembed and update oembed block to use the helpers it provides
Store contact details in a serialized column to make it more easily extensible.