Fix Maruku Ruby 1.9 Bug

In Rbuy 1.8, ?c returns an integer.
In Ruby 1.9, it returns a 1-character
string. This was causing one of our
LaTeX conversion functional tests to
fail.
Fixed.

test/functional/wiki_controller_test.rb

@@ -1263,6 +1263,23 @@ HisWay would be MyWay $\sin(x) \includegraphics[width=3em]{foo}$ in kinda ThatWa
 
 
 
+\end{document}
+!, r.body
+  end
+
+  def test_tex_character_conversions
+    @wiki.write_page('wiki1', 'Page2',
+        "Page2 contents { & ^ <.\n",
+        Time.now, Author.new('AnotherAuthor', '127.0.0.2'), x_test_renderer)
+    r = process('tex', 'web' => 'wiki1', 'id' => 'Page2')
+    assert_response(:success)
+    
+    assert_equal @tex_header1 + @tex_header2 + %q!\section*{Page2}
+
+Page2 contents \{ \& {\tt \symbol{94}} {\tt \symbol{60}}.
+
+
+
 \end{document}
 !, r.body
   end

vendor/plugins/maruku/lib/maruku/output/to_latex_strings.rb

@@ -23,19 +23,19 @@
 class String
 
 	# These are TeX's special characters
-	LATEX_ADD_SLASH = [ ?{, ?}, ?$, ?&, ?#, ?_, ?%]
+	LATEX_ADD_SLASH = [ '{', '}', '$', '&', '#', '_', '%']
 
 	# These, we transform to {\tt \char<ascii code>}
-	LATEX_TO_CHARCODE = [ ?^, ?~, ?>,?<]
+	LATEX_TO_CHARCODE = [ '^', '~', '>', '<']
 
 	def escape_to_latex(s)
 		s2 = ""
-		s.each_byte do |b|
+		s.each_char do |b|
 			if LATEX_TO_CHARCODE.include? b
-				s2 += "{\\tt \\char#{b}}" 
+				s2 += "{\\tt \\symbol{#{b.ord}}}" 
 			elsif LATEX_ADD_SLASH.include? b
 				s2 << ?\\ << b
-			elsif b == ?\\
+			elsif b == '\\'
 			# there is no backslash in cmr10 fonts
 				s2 += "$\\backslash$"
 			else