Allow multiple lexer modes to be specified for a lexer pattern - close #35

Gemfile.lock

@@ -1,6 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base64 (0.2.0)
     date (3.4.1)
     diff-lcs (1.5.1)
     docile (1.4.1)
@@ -37,6 +38,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  base64
   rake
   rdoc
   redcarpet