Add support for raw/verbatim blocks in Jinja/Twig

Jinja provides a `raw` tag and Twig provides a `raw` tag in its
1.x version and a `verbatim` one in newer versions.

To make the code simple, since the Twig lexer extends from the Jinja
one, the latter holds the logic for both tags.

lib/rouge/lexers/jinja.rb

@@ -36,6 +36,16 @@ def self.word_operators
       end
 
       state :root do
+        # Raw and verbatim blocks
+        open_raw_tags  = %r{(\{\%)(\s+)(verbatim|raw)(\s+)(\%\})}
+        close_raw_tags = %r{(\{\%)(\s+)(endverbatim|endraw)(\s+)(\%\})}
+
+        rule /#{open_raw_tags}(.*?)#{close_raw_tags}/m do
+          groups Comment::Preproc, Text, Keyword, Text, Comment::Preproc,
+                 Text,
+                 Comment::Preproc, Text, Keyword, Text, Comment::Preproc
+        end
+
         # Comments
         rule /{#/, Comment, :comment
 

spec/visual/samples/jinja

@@ -20,4 +20,12 @@ Hello {{ user.name|capitalize }} !
 {# A comment on multiple lines
    to hide a piece of code or whatever #}
 
+{% raw %}
+  {% for item in seq %}
+    <li>{{ item }}</li>
+  {% endfor %}
+{% endraw %}
+
+{% raw %} One line {{ raw }} block {% endraw %}
+
 {% include 'footer.html' %}

spec/visual/samples/twig

@@ -12,4 +12,12 @@
   {% flush %}
 {% endif %}
 
+{% verbatim %}
+  {% for item in seq %}
+    <li>{{ item }}</li>
+  {% endfor %}
+{% endverbatim %}
+
+{% verbatim %} One line {{ verbatim }} block {% endverbatim %}
+
 {% include 'footer.html' %}