Better location for math lexer

lib/banzai/filter/syntax_highlight_filter.rb

 require 'rouge/plugins/redcarpet'
 
-module Rouge
-  module Lexers
-    class Math < Lexer
-      title "Plain Text"
-      desc "A boring lexer that doesn't highlight anything"
-
-      tag 'math'
-      mimetypes 'text/plain'
-
-      default_options :token => 'Text'
-
-      def token
-        @token ||= Token[option :token]
-      end
-
-      def stream_tokens(string, &b)
-        yield self.token, string
-      end
-    end
-  end
-end
-
 module Banzai
   module Filter
     # HTML Filter to highlight fenced code blocks

lib/rouge/lexers/math.rb

+module Rouge
+  module Lexers
+    class Math < Lexer
+      title "Plain Text"
+      desc "A boring lexer that doesn't highlight anything"
+
+      tag 'math'
+      mimetypes 'text/plain'
+
+      default_options :token => 'Text'
+
+      def token
+        @token ||= Token[option :token]
+      end
+
+      def stream_tokens(string, &b)
+        yield self.token, string
+      end
+    end
+  end
+end
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