Add failing test for #1013

test/books/structure/README.adoc

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+== Readme for the bookk

test/books/structure/README.md

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+# Readme for GitHub

test/books/structure/SUMMARY.md

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+# Summary

test/books/structure/book.json

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+{
+    "structure": {
+        "readme": "README.adoc"
+    }
+}

test/structure.js

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+describe('Structure', function () {
+    it('should prioritize structure defined in book.json', function() {
+        return books.parse('structure')
+            .then(function(book) {
+                book.readmeFile.should.equal('README.adoc');
+            });
+    });
+});