支持了复数文本解析器，添加对 ReST 解析的支持

%root/rest.rst

@@ -0,0 +1,4 @@
+ReST Parse Test
+===============
+
+This text is parsed from ReST - ReStructured Text parser.

bookshelf.xml

@@ -34,6 +34,7 @@
 		<Page id="main" name="book.sukazyo.cc:: Rebuild In Progress" />
 		<Chapter name="__test_collection__">
 			<Page id="test-regex-highlight" name="RegEx 着色" />
+			<Page id="rest" name="ReST Parser" />
 		</Chapter>
 	</rootBook>
 </BookShelf>