Newlines being preserved in autogenerated summary

[fluffy-critter]

Expected Behavior

The initial extracted paragraph should be processed as Markdown and treated as a single paragraph in the og:description tag

Current Behavior

An entry like:

TItle: foo

This is a test
of whitespace
wrapping

gets an og:description like:

<meta property="og:description" content="This is a test
of whitespace
wrapping">

Possible Solution

Steps to Reproduce (for bugs)

Context

This is probably related to #468 somehow