Add tests for new literalinclude options, and fix an off-by-one bug.

tests/root/literal.inc

@@ -2,3 +2,12 @@
 # -*- coding: utf-8 -*-
 
 foo = u"Including Unicode characters: üöä"
+
+class Foo:
+    pass
+
+class Bar:
+    def baz():
+        pass
+
+def bar(): pass