Added support for org-table syntax

This just adds support for using a plus (+) as an intersection character
instead of requiring pipes (|). The emacs org-mode table syntax
automatically manages ascii tables, but uses pluses for line
intersections.

ext/redcarpet/markdown.c

@@ -2102,7 +2102,7 @@ parse_table_header(
 		while (i < under_end && data[i] == ' ')
 			i++;
 
-		if (i < under_end && data[i] != '|')
+		if (i < under_end && data[i] != '|' && data[i] != '+')
 			break;
 
 		if (dashes < 3)

test/redcarpet_test.rb

@@ -294,6 +294,18 @@ def test_that_tables_flag_works
     assert render_with({:tables => true}, text) =~ /<table/
   end
 
+  def test_that_tables_work_with_org_table_syntax
+    text = <<EOS
+| aaa | bbbb |
+|-----+------|
+|hello|sailor|
+EOS
+
+    assert render_with({}, text) !~ /<table/
+
+    assert render_with({:tables => true}, text) =~ /<table/
+  end
+
   def test_strikethrough_flag_works
     text = "this is ~some~ striked ~~text~~"