Add Great Books of the Western World collection

src/epub/content.opf

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 		<meta id="collection-2" property="belongs-to-collection">The BBC’s 100 Greatest British Novels (2015)</meta>
 		<meta property="collection-type" refines="#collection-2">set</meta>
 		<meta property="group-position" refines="#collection-2">19</meta>
+		<meta id="collection-3" property="belongs-to-collection">Encyclopædia Britannica’s Great Books of the Western World</meta>
+		<meta property="collection-type" refines="#collection-3">set</meta>
 		<dc:description id="description">A wealthy young woman decides to take on the role of patroness and matchmaker to a young protégé, with considerably less than successful results.</dc:description>
 		<meta id="long-description" property="se:long-description" refines="#description">
 			&lt;p&gt;&lt;i&gt;Emma&lt;/i&gt; is one of &lt;a href="https://standardebooks.org/ebooks/jane-austen"&gt;Jane Austen’s&lt;/a&gt; best-loved novels. Its eponymous heroine, Emma Woodhouse, is described in the very first paragraph as “handsome, clever, and rich … and had lived nearly twenty-one years in the world with very little to distress or vex her.” In other words, she has lived a pampered, protected life and consequently is somewhat unrealistic in her regard for herself and her own abilities.&lt;/p&gt;